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

src/x64/lithium-gap-resolver-x64.cc

 // Copyright 2011 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"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/x64/lithium-codegen-x64.h"
 #include "src/x64/lithium-gap-resolver-x64.h"
@@ skipping 170 matching lines @@
         if (cgen_->IsDehoistedKeyConstant(constant_source)) {
           __ Set(dst, constant);
         } else {
           __ Set(dst, static_cast<uint32_t>(constant));
         }
       } else {
         __ Move(dst, cgen_->ToHandle(constant_source));
       }
     } else if (destination->IsDoubleRegister()) {
       double v = cgen_->ToDouble(constant_source);
-      uint64_t int_val = BitCast<uint64_t, double>(v);
+      uint64_t int_val = bit_cast<uint64_t, double>(v);
       XMMRegister dst = cgen_->ToDoubleRegister(destination);
       if (int_val == 0) {
         __ xorps(dst, dst);
       } else {
         __ Set(kScratchRegister, int_val);
         __ movq(dst, kScratchRegister);
       }
     } else {
       DCHECK(destination->IsStackSlot());
       Operand dst = cgen_->ToOperand(destination);
@@ skipping 108 matching lines @@
       moves_[i].set_source(source);
     }
   }
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64