Replace our home-grown BitCast with bit_cast from Chrome/Google3.

src/factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 
 namespace v8 {
@@ skipping 550 matching lines @@
       ApiInstanceType type = JavaScriptObjectType);
 
   Handle<JSFunction> InstallMembers(Handle<JSFunction> function);
 
   // Installs interceptors on the instance.  'desc' is a function template,
   // and instance is an object instance created by the function of this
   // function template.
   MUST_USE_RESULT MaybeHandle<FunctionTemplateInfo> ConfigureInstance(
       Handle<FunctionTemplateInfo> desc, Handle<JSObject> instance);
 
-#define ROOT_ACCESSOR(type, name, camel_name)                                  \
-  inline Handle<type> name() {                                                 \
-    return Handle<type>(BitCast<type**>(                                       \
-        &isolate()->heap()->roots_[Heap::k##camel_name##RootIndex]));          \
+#define ROOT_ACCESSOR(type, name, camel_name)                         \
+  inline Handle<type> name() {                                        \
+    return Handle<type>(bit_cast<type**>(                             \
+        &isolate()->heap()->roots_[Heap::k##camel_name##RootIndex])); \
   }
   ROOT_LIST(ROOT_ACCESSOR)
 #undef ROOT_ACCESSOR
 
-#define STRUCT_MAP_ACCESSOR(NAME, Name, name)                                  \
-  inline Handle<Map> name##_map() {                                            \
-    return Handle<Map>(BitCast<Map**>(                                         \
-        &isolate()->heap()->roots_[Heap::k##Name##MapRootIndex]));             \
-    }
+#define STRUCT_MAP_ACCESSOR(NAME, Name, name)                      \
+  inline Handle<Map> name##_map() {                                \
+    return Handle<Map>(bit_cast<Map**>(                            \
+        &isolate()->heap()->roots_[Heap::k##Name##MapRootIndex])); \
+  }
   STRUCT_LIST(STRUCT_MAP_ACCESSOR)
 #undef STRUCT_MAP_ACCESSOR
 
-#define STRING_ACCESSOR(name, str)                                             \
-  inline Handle<String> name() {                                               \
-    return Handle<String>(BitCast<String**>(                                   \
-        &isolate()->heap()->roots_[Heap::k##name##RootIndex]));                \
+#define STRING_ACCESSOR(name, str)                              \
+  inline Handle<String> name() {                                \
+    return Handle<String>(bit_cast<String**>(                   \
+        &isolate()->heap()->roots_[Heap::k##name##RootIndex])); \
   }
   INTERNALIZED_STRING_LIST(STRING_ACCESSOR)
 #undef STRING_ACCESSOR
 
   inline void set_string_table(Handle<StringTable> table) {
     isolate()->heap()->set_string_table(*table);
   }
 
   Handle<String> hidden_string() {
     return Handle<String>(&isolate()->heap()->hidden_string_);
@@ skipping 103 matching lines @@
   // Reinitialize a JSProxy into an (empty) JS object of respective type and
   // size, but keeping the original prototype.  The receiver must have at least
   // the size of the new object.  The object is reinitialized and behaves as an
   // object that has been freshly allocated.
   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_