Landing for hans@chromium.org.

TYPE_CHECK in v8.h should assign to volatile qualified null-pointer.

Unless the pointer is volatile qualified, Clang will warn that LLVM
removes the assignment during optimization. This is not a problem as
that code should never execute, but the warning is treated as an error
when building Chromium, and thus stops the build.

Code review URL: http://codereview.chromium.org/3005010/show

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5093 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -146,9 +146,9 @@ typedef void (*WeakReferenceCallback)(Persistent<Value> object,
 
 // --- H a n d l e s ---
 
-#define TYPE_CHECK(T, S)                              \
-  while (false) {                                     \
-    *(static_cast<T**>(0)) = static_cast<S*>(0);      \
+#define TYPE_CHECK(T, S)                                       \
+  while (false) {                                              \
+    *(static_cast<T* volatile*>(0)) = static_cast<S*>(0);      \
   }
 
 /**