clang trunk: assertion failed in cast<FunctionProtoType> during Sema address-of overloaded candidate with #pragma weak aliasing function and variable

## Compiler Explorer: https://godbolt.org/z/djMfxczGj

- clang start crashing on `Trunk`
- generated by fuzzer

## Console
```console
clang: /root/llvm-project/llvm/include/llvm/Support/Casting.h:572: decltype(auto) llvm::cast(From*) [with To = clang::FunctionProtoType; From = const clang::FunctionType]: Assertion `isa(Val) && "cast() argument of incompatible type!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics
1. :12:24: current parser token '||'
2. :11:16: parsing function body 'main'
3. :11:16: in compound statement ('{}')
#0 0x00000000042ecab8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42ecab8)
#1 0x00000000042e9ee4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42e9ee4)
#2 0x000000000422ec88 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000782971a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000782971a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000782971a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000782971a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000782971a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000782971a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000072fc666 clang::Sema::FunctionNonObjectParamTypesAreEqual(clang::FunctionDecl const*, clang::FunctionDecl const*, unsigned int*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x72fc666)
#10 0x00000000072fc727 sameFunctionParameterTypeLists(clang::Sema&, clang::FunctionDecl*, clang::FunctionDecl*, bool, bool) SemaOverload.cpp:0:0
#11 0x0000000007308625 clang::Sema::resolveAddressOfSingleOverloadCandidate(clang::Expr*, clang::DeclAccessPair&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7308625)
#12 0x0000000007308922 clang::Sema::resolveAndFixAddressOfSingleOverloadCandidate(clang::ActionResult&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7308922)
#13 0x0000000006f6c4a5 clang::Sema::CheckPlaceholderExpr(clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6f6c4a5)
#14 0x0000000006f8ac8d clang::Sema::BuildUnaryOp(clang::Scope*, clang::SourceLocation, clang::UnaryOperatorKind, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6f8ac8d)
#15 0x0000000006a989e2 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a989e2)
#16 0x0000000006a9a777 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a9a777)
#17 0x0000000006a9b846 clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult, clang::prec::Level) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a9b846)
#18 0x0000000006a9ede9 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a9ede9)
#19 0x0000000006b18c36 clang::Parser::ParseParenExprOrCondition(clang::ActionResult*, clang::Sema::ConditionResult&, clang::SourceLocation, clang::Sema::ConditionKind, clang::SourceLocation&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b18c36)
#20 0x0000000006b1daf6 clang::Parser::ParseIfStatement(clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b1daf6)
#21 0x0000000006b1b63d clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b1b63d)
#22 0x0000000006b1c536 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b1c536)
#23 0x0000000006b24e7e clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b24e7e)
#24 0x0000000006b256ca clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6b256ca)
#25 0x0000000006a2b62b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a2b62b)
#26 0x0000000006a61aed clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a61aed)
#27 0x0000000006a1e78b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1e78b)
#28 0x0000000006a1ef7f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1ef7f)
#29 0x0000000006a26daa clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a26daa)
#30 0x0000000006a27d45 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a27d45)
#31 0x0000000006a08dca clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a08dca)
#32 0x0000000004c4dde8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c4dde8)
#33 0x0000000004f446e5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f446e5)
#34 0x0000000004ec497e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ec497e)
#35 0x000000000503ea6d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x503ea6d)
#36 0x0000000000de5b4c cc1_main(llvm::ArrayRef, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde5b4c)
#37 0x0000000000ddc59a ExecuteCC1Tool(llvm::SmallVectorImpl&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr) driver.cpp:0:0
#38 0x0000000000ddc71d int llvm::function_ref&)>::callback_fn&)>(long, llvm::SmallVectorImpl&) driver.cpp:0:0
#39 0x0000000004cc0739 void llvm::function_ref::callback_fn>, std::__cxx11::basic_string, std::allocator>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#40 0x000000000422f124 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x422f124)
#41 0x0000000004cc0d4f clang::driver::CC1Command::Execute(llvm::ArrayRef>, std::__cxx11::basic_string, std::allocator>*, bool*) const (.part.0) Job.cpp:0:0
#42 0x0000000004c81832 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c81832)
#43 0x0000000004c827de clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c827de)
#44 0x0000000004c89c35 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c89c35)
#45 0x0000000000de1f41 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xde1f41)
#46 0x0000000000c8cf94 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc8cf94)
#47 0x0000782971a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#48 0x0000782971a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#49 0x0000000000ddc035 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xddc035)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```

## Code
```c
#include

static unsigned long lv1 = Af1a() != 0x510bea7UL;
#pragma weak Av1a = lv1
extern unsigned long Av1a;

static unsigned long lf1(void) { return 0x510bea7UL; }
#pragma weak Af1a = lf1
extern unsigned long Af1a(void);

int main(void) {
if (!&Av1a || !&Af1a || Av1a != 0xdeadbeefUL || 0xdeadbeefUL)
abort();
exit(0);
}
```

Reproduce the crash with the C source and Clang assertion build from the Compiler Explorer link. Start in SemaOverload.cpp at Sema::FunctionNonObjectParamTypesAreEqual and the address-of overload resolution entry points shown in the stack trace. Done means the reproducer no longer triggers the incompatible FunctionProtoType cast assertion and regression coverage is added.

Written by the indexing model from the issue text.