Revert r320978 "No -fsanitize=function warning when calling noexcept function through non-noexcept pointer in C++17"

At least <http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-android/
builds/6013/steps/annotate/logs/stdio> complains about
__ubsan::__ubsan_handle_function_type_mismatch_abort (compiler-rt
lib/ubsan/ubsan_handlers.cc) returning now despite being declared 'noreturn', so
looks like a different approach is needed for the function_type_mismatch check
to be called also in cases that may ultimately succeed.

llvm-svn: 320982

clang/lib/CodeGen/CGExpr.cpp

@@ -4504,14 +4504,10 @@ RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee
           Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
       llvm::Constant *StaticData[] = {
         EmitCheckSourceLocation(E->getLocStart()),
-        EmitCheckTypeDescriptor(CalleeType),
-        cast<FunctionProtoType>(FnType)->isNothrow(getContext())
-          ? llvm::Constant::getNullValue(FTRTTIConst->getType())
-          : FTRTTIConst
+        EmitCheckTypeDescriptor(CalleeType)
       };
       EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
-                SanitizerHandler::FunctionTypeMismatch, StaticData,
-                {CalleePtr, CalleeRTTI});
+                SanitizerHandler::FunctionTypeMismatch, StaticData, CalleePtr);
 
       Builder.CreateBr(Cont);
       EmitBlock(Cont);