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

src/compiler/node-cache.cc

 // 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.
 
 #include "src/compiler/node-cache.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 13 matching lines @@
 
 
 template <>
 inline int32_t NodeCacheHash(int64_t key) {
   return ComputeLongHash(key);
 }
 
 
 template <>
 inline int32_t NodeCacheHash(double key) {
-  return ComputeLongHash(BitCast<int64_t>(key));
+  return ComputeLongHash(bit_cast<int64_t>(key));
 }
 
 
 template <>
 inline int32_t NodeCacheHash(void* key) {
   return ComputePointerHash(key);
 }
 
 
 template <typename Key>
@@ skipping 66 matching lines @@
   return &entry->value_;
 }
 
 
 template class NodeCache<int64_t>;
 template class NodeCache<int32_t>;
 template class NodeCache<void*>;
 }
 }
 }  // namespace v8::internal::compiler