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

[Chuanqi Xu 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);
----------------
ChuanqiXu9 wrote:

Sorry at first as I didn't look through all the patches. But we do want to 
avoid predefined types if possible. Why does the types are special enough that 
we have to write them unconditionally?

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