Build fix: Don't use __builtin_mul_overflow on PLATFORM(IOS_FAMILY_SI…

…MULATOR).

https://bugs.webkit.org/show_bug.cgi?id=240937

Reviewed by Saam Barati and Alex Christensen.

The __mulodi4 symbol used by clang for __builtin_mul_overflow is not available.

* Source/WTF/wtf/CheckedArithmetic.h:

Canonical link: https://commits.webkit.org/250993@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294861 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WTF/wtf/CheckedArithmetic.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2021 Apple Inc. All rights reserved.
+ * Copyright (C) 2011-2022 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -34,7 +34,7 @@
 /* On Linux with clang, libgcc is usually used instead of compiler-rt, and it does
  * not provide the __mulodi4 symbol used by clang for __builtin_mul_overflow
  */
-#if COMPILER(GCC) || (COMPILER(CLANG) && !(CPU(ARM) && OS(LINUX)))
+#if COMPILER(GCC) || (COMPILER(CLANG) && !(CPU(ARM) && OS(LINUX))) && !PLATFORM(IOS_FAMILY_SIMULATOR)
 #define USE_MUL_OVERFLOW 1
 #endif