Enable int128_t if CPU(ADDRESS64)

https://bugs.webkit.org/show_bug.cgi?id=274049
rdar://127951893

Reviewed by Justin Michaud.

Let's enable int128_t when CPU(ADDRESS64). Under this condition, clang and GCC can support it.

* Source/WTF/wtf/PlatformHave.h:

Canonical link: https://commits.webkit.org/278706@main

Source/WTF/wtf/PlatformHave.h

@@ -177,7 +177,8 @@
 #define HAVE_PTHREAD_MAIN_NP 1
 #endif
 
-#if OS(DARWIN) && (CPU(X86_64) || CPU(ARM64)) && CPU(ADDRESS64)
+/* watchOS (ARM64_32) must not use int128_t because of wrong behavior. */
+#if (OS(DARWIN) || OS(LINUX)) && CPU(ADDRESS64)
 #define HAVE_INT128_T 1
 #endif