Assertion failure in VM/JSObject.h: "getParent cannot be used with proxy objects"

## Bug Description

Hello, I found a crash in Hermes where valid JavaScript triggers an assertion failure. It seems Hermes incorrectly treats a proxy like an ordinary object

Hermes git revision (if applicable): https://github.com/facebook/hermes/commit/aa4dc53995121184faadceecf2d9d0a535f962c7, the latest commit on static_h
OS: Linux

## Steps To Reproduce

1. build the debug version of the Hermes CLI
2. run `hermes crash.js`

crash.js
```js
class A {}
let h = {};
class B extends new Proxy(A, h) {}
class C extends B {
static f() {
B.y = 0;
super.x;
}
}
Object.setPrototypeOf(C.prototype, new Proxy({}, {}));
h.get = (a, b, r) => r.y = 1;
C.f();
```

output:
```sh
hermes: hermes/include/hermes/VM/JSObject.h:464: const hermes::vm::GCPointer& hermes::vm::JSObject::getParentGCPtr() const: Assertion `!flags_.proxyObject && "getParent cannot be used with proxy objects"' failed.
Aborted (core dumped)
```

backtrace:
```sh
(gdb) bt
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007ffff704527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007ffff70288ff in __GI_abort () at ./stdlib/abort.c:79
#5 0x00007ffff702881b in __assert_fail_base (fmt=0x7ffff71d01e8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
assertion=assertion@entry=0x5555565c1950 "!flags_.proxyObject && \"getParent cannot be used with proxy objects\"",
file=file@entry=0x5555565c1920 "hermes/include/hermes/VM/JSObject.h", line=line@entry=464,
function=function@entry=0x5555565c18c0 "const hermes::vm::GCPointer& hermes::vm::JSObject::getParentGCPtr() const") at ./assert/assert.c:96
#6 0x00007ffff703b517 in __assert_fail (
assertion=0x5555565c1950 "!flags_.proxyObject && \"getParent cannot be used with proxy objects\"",
file=0x5555565c1920 "hermes/include/hermes/VM/JSObject.h", line=464,
function=0x5555565c18c0 "const hermes::vm::GCPointer& hermes::vm::JSObject::getParentGCPtr() const")
at ./assert/assert.c:105
#7 0x0000555555d59909 in hermes::vm::JSObject::getParentGCPtr (this=0x7ffff44482d8)
at hermes/include/hermes/VM/JSObject.h:464
#8 0x0000555555d598ae in hermes::vm::JSObject::getParent (this=0x7ffff44482d8, runtime=...)
at hermes/include/hermes/VM/JSObject.h:459
#9 0x0000555555dc01d3 in hermes::vm::JSObject::tryCacheAddProperty (self=0x7ffff4448600, runtime=...,
runtimeModule=0x555556c58df0, unit=0x0, writeCacheEntry=0x555556c6fc28, startClazz=0x7ffff37e9788, slot=7,
resultClazz=0x7ffff37e96d0) at hermes/lib/VM/JSObject.cpp:2942
#10 0x0000555555dc0786 in hermes::vm::JSObject::addOwnPropertyImpl (selfHandle=..., runtime=..., name=..., propertyFlags=...,
valueOrAccessor=..., runtimeModule=0x555556c58df0, unit=0x0, cacheEntry=0x555556c6fc28)
at hermes/lib/VM/JSObject.cpp:3028
#11 0x0000555555dbffc2 in hermes::vm::JSObject::addOwnProperty (selfHandle=..., runtime=..., name=..., dpFlags=...,
valueOrAccessor=..., opFlags=..., runtimeModule=0x555556c58df0, unit=0x0, cacheEntry=0x555556c6fc28)
at hermes/lib/VM/JSObject.cpp:2898
--Type for more, q to quit, c to continue without paging--
#12 0x0000555555db9dd5 in hermes::vm::JSObject::putNamedWithReceiver_RJS (selfHandle=..., runtime=..., name=..., valueHandle=...,
receiver=..., opFlags=..., runtimeModule=0x555556c58df0, unit=0x0, cacheEntry=0x555556c6fc28)
at hermes/lib/VM/JSObject.cpp:1600
#13 0x000055555575fcb3 in hermes::vm::JSObject::putNamed_RJS (selfHandle=..., runtime=..., name=..., valueHandle=...,
opFlags=..., runtimeModule=0x555556c58df0, unit=0x0, cacheEntry=0x555556c6fc28)
at hermes/include/hermes/VM/JSObject.h:2126
#14 0x0000555555d90f3a in hermes::vm::Interpreter::putByIdSlowPath_RJS (runtime=..., curCodeBlock=0x555556c6fc00,
base=0x7ffff7700180, value=0x7ffff7700178, cacheIdx=0 '\000', id=..., strictMode=false, tryProp=false)
at hermes/lib/VM/Interpreter-slowpaths.cpp:1807
#15 0x0000555555d90ac5 in hermes::vm::doPutByIdSlowPath_RJS (runtime=..., frameRegs=0x7ffff7700178, ip=0x555556c59906,
curCodeBlock=0x555556c6fc00, idVal=8, strictMode=false, tryProp=false)
at hermes/lib/VM/Interpreter-slowpaths.cpp:1740
#16 0x0000555555d67182 in hermes::vm::Interpreter::interpretFunction (runtime=..., state=...)
at hermes/lib/VM/Interpreter.cpp:2091
#17 0x0000555555d5c054 in hermes::vm::Runtime::interpretFunctionImpl (this=0x555556c63e70, newCodeBlock=0x555556c6fc00)
at hermes/lib/VM/Interpreter.cpp:437
#18 0x0000555555d5c13c in hermes::vm::Runtime::interpretFunction (this=0x555556c63e70, newCodeBlock=0x555556c6fc00)
at hermes/lib/VM/Interpreter.cpp:457
#19 0x0000555555d1ccda in hermes::vm::JSFunction::_interpret (this=0x7ffff44488f8, runtime=...)
at hermes/include/hermes/VM/Callable.h:1041
#20 0x0000555555d221c1 in hermes::vm::JSFunction::_callImpl (selfHandle=..., runtime=...)
at hermes/lib/VM/Callable.cpp:1447
#21 0x0000555555760133 in hermes::vm::Callable::call (selfHandle=..., runtime=...)
at hermes/include/hermes/VM/Callable.h:286
#22 0x0000555555d1e573 in hermes::vm::Callable::executeCall3 (selfHandle=..., runtime=..., thisArgHandle=..., param1=...,
param2=..., param3=..., construct=false) at hermes/lib/VM/Callable.cpp:384
#23 0x0000555555dd0cbc in hermes::vm::(anonymous namespace)::getWithTrap (runtime=..., nameValHandle=..., trap=..., handler=...,
target=..., receiver=...) at hermes/lib/VM/JSProxy.cpp:891
--Type for more, q to quit, c to continue without paging--
#24 0x0000555555dd141e in hermes::vm::JSProxy::getNamed (selfHandle=..., runtime=..., name=..., receiver=...)
at hermes/lib/VM/JSProxy.cpp:969
#25 0x0000555555db7697 in hermes::vm::JSObject::getNamedWithReceiver_RJS (selfHandle=..., runtime=..., name=..., receiver=...,
opFlags=..., cacheEntry=0x555556c6fbc8) at hermes/lib/VM/JSObject.cpp:1201
#26 0x0000555555d8fd71 in hermes::vm::doGetByIdWithReceiverSlowPath_RJS (runtime=..., frameRegs=0x7ffff77000f8,
ip=0x555556c54c79, curCodeBlock=0x555556c6fba0) at hermes/lib/VM/Interpreter-slowpaths.cpp:1609
#27 0x0000555555d668c6 in hermes::vm::Interpreter::interpretFunction (runtime=..., state=...)
at hermes/lib/VM/Interpreter.cpp:1981
#28 0x0000555555d5c054 in hermes::vm::Runtime::interpretFunctionImpl (this=0x555556c63e70, newCodeBlock=0x555556c57840)
at hermes/lib/VM/Interpreter.cpp:437
#29 0x0000555555d5c13c in hermes::vm::Runtime::interpretFunction (this=0x555556c63e70, newCodeBlock=0x555556c57840)
at hermes/lib/VM/Interpreter.cpp:457
#30 0x0000555555e2929f in hermes::vm::Runtime::runBytecode (this=0x555556c63e70, bytecode=..., flags=..., sourceURL=...,
environment=..., thisArg=..., newTarget=...) at hermes/lib/VM/Runtime.cpp:1251
#31 0x00005555556b77a3 in hermes::vm::Runtime::runBytecode (this=0x555556c63e70, bytecode=..., runtimeModuleFlags=...,
sourceURL=..., environment=...) at hermes/include/hermes/VM/Runtime.h:332
#32 0x00005555556bdb39 in hermes::(anonymous namespace)::executeHBCBytecodeImpl (bytecode=..., options=...,
filename=0x7fffffffde38) at hermes/lib/ConsoleHost/ConsoleHost.cpp:1051
#33 0x00005555556be245 in operator() (__closure=0x7fffffffd6a0) at hermes/lib/ConsoleHost/ConsoleHost.cpp:1181
#34 0x00005555556c1b72 in hermes::(anonymous namespace)::maybeCatchException&&, const ExecuteOptions&, const std::string*):: >(const struct {...} &) (f=...)
at hermes/lib/ConsoleHost/ConsoleHost.cpp:746
#35 0x00005555556be299 in hermes::executeHBCBytecode (bytecode=..., options=..., filename=0x7fffffffde38)
at hermes/lib/ConsoleHost/ConsoleHost.cpp:1180
#36 0x00005555556d1b88 in executeHBCBytecodeFromCL (bytecode=std::unique_ptr = {...}, info=...)
at hermes/tools/hermes/hermes.cpp:186
#37 0x00005555556d2346 in main (argc=2, argv=0x7fffffffe078) at hermes/tools/hermes/hermes.cpp:305
```

## The Expected Behavior
There should be no crash as the code is valid.

Build the debug Hermes CLI and reproduce the failure with the supplied crash.js. Start in hermes/lib/VM/JSObject.cpp at tryCacheAddProperty and inspect the related proxy path in hermes/lib/VM/JSProxy.cpp, using the backtrace as the entry point. Done means the valid program runs without the getParent assertion failure.

Written by the indexing model from the issue text.