[clang] [flang] [llvm] Add clang warning if fp exception functions are called without appropriate flags/pragmas (PR #199009)

[Marcos Ramirez Joos via cfe-commits]

================
@@ -6162,6 +6162,8 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema *SemaPtr, 
StringRef isysroot,
     AddTypeRef(Context, Context.ObjCClassRedefinitionType, SpecialTypes);
     AddTypeRef(Context, Context.ObjCSelRedefinitionType, SpecialTypes);
     AddTypeRef(Context, Context.getucontext_tType(), SpecialTypes);
+    AddTypeRef(Context, Context.getfexcept_tType(), SpecialTypes);
+    AddTypeRef(Context, Context.getfenv_tType(), SpecialTypes);
----------------
maarcosrmz wrote:

If I understood the recognition mechanism correctly, were we not to treat them 
as predefined types, we would not be able to recognize the functions from the 
fenv.h header (see 
[Builtins.td](https://github.com/llvm/llvm-project/pull/199009/changes#diff-987cbd809c993aa5915def17d1f8276fd08a12aa906f56335faee50044ac5537R4706-R4709)),
 which take arguments of these types.

https://github.com/llvm/llvm-project/pull/199009
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