[Bug]: Illegal instruction during debugger attach for generator

### ChakraCore Version

622c745

### Steps to reproduce

Build ChakraCore with the default configuration:
```
./build.sh -d
```

Run ChakraCore with the provided input:
```
./out/Debug/ch test.js
```

### Proof of concept

```js
function empty() { }
WScript.Attach(empty)

function * basicGenerator(a, b) {
print("Beginning test of " + arguments.callee.name);
}
```

### Exception or Error

```text
ASSERTION 2767936: (/home/chakracore/lib/Runtime/Debug/DebugContext.cpp, line 359) pFuncBody->GetYieldRegister() == oldYieldRegister
Failure: (pFuncBody->GetYieldRegister() == oldYieldRegister)
Illegal instruction (core dumped)

(gdb) run
Starting program: /home/chakracore/out/Debug/ch test.js
warning: Error disabling address space randomization: Operation not permitted
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7f8078f1f700 (LWP 2767966)]
[New Thread 0x7f8073fff700 (LWP 2767967)]
[New Thread 0x7f80737fe700 (LWP 2767968)]
ASSERTION 2767962: (/home/chakracore/lib/Runtime/Debug/DebugContext.cpp, line 359) pFuncBody->GetYieldRegister() == oldYieldRegister
Failure: (pFuncBody->GetYieldRegister() == oldYieldRegister)

Thread 1 "ch" received signal SIGILL, Illegal instruction.
0x00007f8879bd4aaa in Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}::operator()(Js::FunctionBody*) const (this=0x7fff038b8570, pFuncBody=0x7f80786c73e0)
at /home/chakracore/lib/Runtime/Debug/DebugContext.cpp:359
359 AssertOrFailFast(pFuncBody->GetYieldRegister() == oldYieldRegister);
(gdb) bt
#0 0x00007f8879bd4aaa in Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}::operator()(Js::FunctionBody*) const (this=0x7fff038b8570, pFuncBody=0x7f80786c73e0)
at /home/chakracore/lib/Runtime/Debug/DebugContext.cpp:359
#1 0x00007f8879bd49c0 in Js::Utf8SourceInfo::MapFunction(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}::operator()(unsigned int, Js::FunctionBody*) const (this=0x7fff038b8570, functionBody=0x7f80786c73e0)
at /home/chakracore/lib/Runtime/./Base/Utf8SourceInfo.h:164
#2 0x00007f8879bd490a in JsUtil::BaseDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int const&, Js::FunctionBody* const&)#1}::operator()(Js::Utf8SourceInfo::MapFunction(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}, unsigned int const&) const (
this=0x7fff038b8570, key=@0x7f8078f5405c: 2, value=@0x7f8078f54050: 0x7f80786c73e0)
at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:580
#3 0x00007f8879bd48cc in JsUtil::BaseDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::MapUntil, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int const&, Js::FunctionBody* const&)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(JsUtil::SimpleDictionaryEntry > const&)#1}::operator()(Memory::WriteBarrierPtr) const (
this=0x7fff038b8570, entry=...) at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:590
#4 0x00007f8879bd4824 in JsUtil::BaseDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::MapEntryUntil, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::MapUntil, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoRes--Type for more, q to quit, c to continue without paging--
izeLock>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int const&, Js::FunctionBody* const&)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(JsUtil::SimpleDictionaryEntry > const&)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const (this=0x7f80786c2340, fn=...)
at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:756
#5 0x00007f8879bd4755 in JsUtil::BaseDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::MapUntil, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int const&, Js::FunctionBody* const&)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const (this=0x7f80786c2340, fn=...)
at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:588
#6 0x00007f8879bd4725 in JsUtil::BaseDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, JsUtil::NoResizeLock>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const (this=0x7f80786c2340, fn=...)
at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:578
#7 0x00007f8879bd46f6 in JsUtil::SynchronizedDictionary, DefaultComparer, JsUtil::SimpleDictionaryEntry, Js::DefaultContainerLockPolicy, CriticalSection>::Map(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const::{lambda(unsigned int, Js::FunctionBody*)#1}>(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const (this=0x7f80786c2340, fn=...)
at /home/chakracore/lib/Common/DataStructures/BaseDictionary.h:1841
#8 0x00007f8879bd3daa in Js::Utf8SourceInfo::MapFunction(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int,--Type for more, q to quit, c to continue without paging--
Js::Utf8SourceInfo*) const::{lambda(Js::FunctionBody*)#3}) const (this=0x7f80786c6000, mapper=...)
at /home/chakracore/lib/Runtime/./Base/Utf8SourceInfo.h:162
#9 0x00007f8879bd3c66 in Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1::operator()(int, Js::Utf8SourceInfo*) const (
this=0x7fff038b88d0, index=0, sourceInfo=0x7f80786c6000)
at /home/chakracore/lib/Runtime/Debug/DebugContext.cpp:352
#10 0x00007f8879bd306f in JsUtil::List::MapUntilFrom(int, Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1) const (this=0x7f80785e39f0, start=0, map=...) at /home/chakracore/lib/Common/DataStructures/List.h:531
#11 0x00007f8879bd2a59 in JsUtil::List::MapUntil(Js::DebugContext::RundownSourcesAndReparse(bool, bool)::$_1) const
(this=0x7f80785e39f0, map=...) at /home/chakracore/lib/Common/DataStructures/List.h:521
#12 0x00007f8879bd287a in Js::DebugContext::RundownSourcesAndReparse (this=0x55e3d2a41ed8, shouldPerformSourceRundown=true,
shouldReparseFunctions=true) at /home/chakracore/lib/Runtime/Debug/DebugContext.cpp:224
#13 0x00007f88799b2ee5 in Js::ScriptContext::OnDebuggerAttached (this=0x55e3d2a40788)
at /home/chakracore/lib/Runtime/Base/ScriptContext.cpp:3659
#14 0x00007f887934b864 in JsDiagStartDebugging::$_0::operator() (this=0x7fff038b8f10)
at /home/chakracore/lib/Jsrt/JsrtDiag.cpp:96
#15 0x00007f887934b3e8 in GlobalAPIWrapper_NoRecord(JsDiagStartDebugging::$_0)::{lambda()#1}::operator()() const (this=0x7fff038b8ed8) at /home/chakracore/lib/Jsrt/JsrtInternal.h:167
#16 0x00007f887934aff2 in GlobalAPIWrapper_Core(JsDiagStartDebugging::$_0)::{lambda()#1}>(GlobalAPIWrapper_NoRecord(JsDiagStartDebugging::$_0)::{lambda()#1}) (fn=...)
at /home/chakracore/lib/Jsrt/JsrtInternal.h:127
#17 0x00007f887934a809 in GlobalAPIWrapper_NoRecord (fn=...)
at /home/chakracore/lib/Jsrt/JsrtInternal.h:165
#18 0x00007f887934a7de in JsDiagStartDebugging (runtimeHandle=0x55e3d2a0da58,
debugEventCallback=0x55e3ca759670 , callbackState=0x55e3d2a4fe10)
at /home/chakracore/lib/Jsrt/JsrtDiag.cpp:54
#19 0x000055e3ca75cf20 in ChakraRTInterface::JsDiagStartDebugging (runtimeHandle=0x55e3d2a0da58,
debugEventCallback=0x55e3ca759670 , callbackState=0x55e3d2a4fe10)
at /home/chakracore/bin/ch/ChakraRtInterface.h:444
#20 0x000055e3ca75be3e in Debugger::StartDebugging (this=0x55e3d2a4fe10, runtime=0x55e3d2a0da58)
at /home/chakracore/bin/ch/Debugger.cpp:404
#21 0x000055e3ca7698b6 in WScriptJsrt::AttachCallback(void*, bool, void**, unsigned short, void*)::$_1::operator()(WScriptJsrt::CallbackMessage&) const (this=0x55e3d2a4fdc8, msg=warning: RTTI symbol not found for class 'CustomMessage'
...) at /home/chakracore/bin/ch/WScriptJsrt.cpp:963
#22 0x000055e3ca769859 in CustomMessage for more, q to quit, c to continue without paging--
backMessage>::Call(char const*) (this=0x55e3d2a4fdb0, fileName=0x55e3d2a0d310 "test.js")
at /home/chakracore/bin/ch/MessageQueue.h:281
#23 0x000055e3ca7572ce in MessageQueue::ProcessAll (this=0x55e3d2a4eb60, fileName=0x55e3d2a0d310 "test.js")
at /home/chakracore/bin/ch/MessageQueue.h:256
#24 0x000055e3ca7548ac in RunScript (fileName=0x55e3d2a0d310 "test.js",
fileContents=0x55e3d2a0e3a0 "function empty() { }\nWScript.Attach(empty)\n\nfunction * basicGenerator(a, b) {\n print(\"Beginning test of \" + arguments.callee.name);\n}\n", fileLength=137,
fileContentsFinalizeCallback=0x55e3ca761bf0 , bufferValue=0x0,
fullPath=0x7fff038b93b0 "/home/test.js", parserStateCache=0x0) at /home/chakracore/bin/ch/ch.cpp:480
#25 0x000055e3ca756300 in ExecuteTest (fileName=0x55e3d2a0d310 "test.js")
at /home/chakracore/bin/ch/ch.cpp:917
#26 0x000055e3ca7563bc in ExecuteTestWithMemoryCheck (fileName=0x55e3d2a0d310 "test.js")
at /home/chakracore/bin/ch/ch.cpp:967
#27 0x000055e3ca756c87 in main (argc=2, c_argv=0x7fff038b97f8) at /home/chakracore/bin/ch/ch.cpp:1275
```

### Additional Context

Calling `WScript.Attach` in a script that defines a generator function using `arguments.callee` triggers a crash in ChakraCore. The crash occurs during the debugger attachment process.