Bug 643548: Remove mozalloc_undef_macro_wrappers hack from JS engine. (r=luke,rs=brendan)

mozalloc_undef_macro_wrappers are brittle and have side-effects that are hard
to debug and fix. The alternative is the just stick an underscore on the end of
malloc, free, etc, which is a comparatively small burden.

js/src/jsdate.cpp

@@ -2406,7 +2406,7 @@ date_toSource(JSContext *cx, uintN argc, Value *vp)
     }
 
     JSString *str = JS_NewStringCopyZ(cx, bytes);
-    cx->free(bytes);
+    cx->free_(bytes);
     if (!str)
         return false;
     vp->setString(str);