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

src/compiler/js-graph.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/js-graph.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/typer.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 116 matching lines @@
     return NullConstant();
   } else if (value->IsTheHole()) {
     return TheHoleConstant();
   } else {
     return HeapConstant(value);
   }
 }
 
 
 Node* JSGraph::Constant(double value) {
-  if (BitCast<int64_t>(value) == BitCast<int64_t>(0.0)) return ZeroConstant();
-  if (BitCast<int64_t>(value) == BitCast<int64_t>(1.0)) return OneConstant();
+  if (bit_cast<int64_t>(value) == bit_cast<int64_t>(0.0)) return ZeroConstant();
+  if (bit_cast<int64_t>(value) == bit_cast<int64_t>(1.0)) return OneConstant();
   return NumberConstant(value);
 }
 
 
 Node* JSGraph::Constant(int32_t value) {
   if (value == 0) return ZeroConstant();
   if (value == 1) return OneConstant();
   return NumberConstant(value);
 }
 
@@ skipping 28 matching lines @@
 Node* JSGraph::ExternalConstant(ExternalReference reference) {
   Node** loc = cache_.FindExternalConstant(reference);
   if (*loc == NULL) {
     *loc = NewNode(common()->ExternalConstant(reference));
   }
   return *loc;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8