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

src/bootstrapper.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_BOOTSTRAPPER_H_
 #define V8_BOOTSTRAPPER_H_
 
 #include "src/factory.h"
 
 namespace v8 {
 namespace internal {
 
 // A SourceCodeCache uses a FixedArray to store pairs of
 // (AsciiString*, JSFunction*), mapping names of native code files
 // (runtime.js, etc.) to precompiled functions. Instead of mapping
 // names to functions it might make sense to let the JS2C tool
 // generate an index for each native JS file.
 class SourceCodeCache FINAL BASE_EMBEDDED {
  public:
   explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
 
   void Initialize(Isolate* isolate, bool create_heap_objects) {
     cache_ = create_heap_objects ? isolate->heap()->empty_fixed_array() : NULL;
   }
 
   void Iterate(ObjectVisitor* v) {
-    v->VisitPointer(BitCast<Object**, FixedArray**>(&cache_));
+    v->VisitPointer(bit_cast<Object**, FixedArray**>(&cache_));
   }
 
   bool Lookup(Vector<const char> name, Handle<SharedFunctionInfo>* handle) {
     for (int i = 0; i < cache_->length(); i+=2) {
       SeqOneByteString* str = SeqOneByteString::cast(cache_->get(i));
       if (str->IsUtf8EqualTo(name)) {
         *handle = Handle<SharedFunctionInfo>(
             SharedFunctionInfo::cast(cache_->get(i + 1)));
         return true;
       }
@@ skipping 124 matching lines @@
   virtual size_t length() const OVERRIDE { return length_; }
 
  private:
   const char* data_;
   size_t length_;
 };
 
 }}  // namespace v8::internal
 
 #endif  // V8_BOOTSTRAPPER_H_