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

src/hydrogen-instructions.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/base/bits.h"
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
@@ skipping 2626 matching lines @@
 
 
 OStream& HEnterInlined::PrintDataTo(OStream& os) const {  // NOLINT
   return os << function()->debug_name()->ToCString().get()
             << ", id=" << function()->id().ToInt();
 }
 
 
 static bool IsInteger32(double value) {
   double roundtrip_value = static_cast<double>(static_cast<int32_t>(value));
-  return BitCast<int64_t>(roundtrip_value) == BitCast<int64_t>(value);
+  return bit_cast<int64_t>(roundtrip_value) == bit_cast<int64_t>(value);
 }
 
 
 HConstant::HConstant(Handle<Object> object, Representation r)
   : HTemplateInstruction<0>(HType::FromValue(object)),
     object_(Unique<Object>::CreateUninitialized(object)),
     object_map_(Handle<Map>::null()),
     has_stable_map_value_(false),
     has_smi_value_(false),
     has_int32_value_(false),
@@ skipping 2100 matching lines @@
       break;
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 } }  // namespace v8::internal