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

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 900 matching lines @@
           break;
         case kImm64Handle:
           __ Move(dst, imm.handle);
           break;
       }
       if (destination->IsStackSlot()) {
         __ movq(g.ToOperand(destination), kScratchRegister);
       }
     } else {
       __ movq(kScratchRegister,
-              BitCast<uint64_t, double>(g.ToDouble(constant_source)));
+              bit_cast<uint64_t, double>(g.ToDouble(constant_source)));
       if (destination->IsDoubleRegister()) {
         __ movq(g.ToDoubleRegister(destination), kScratchRegister);
       } else {
         DCHECK(destination->IsDoubleStackSlot());
         __ movq(g.ToOperand(destination), kScratchRegister);
       }
     }
   } else if (source->IsDoubleRegister()) {
     XMMRegister src = g.ToDoubleRegister(source);
     if (destination->IsDoubleRegister()) {
@@ skipping 67 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8