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

src/compiler/operator.h

 // 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.
 
 #ifndef V8_COMPILER_OPERATOR_H_
 #define V8_COMPILER_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/ostreams.h"
 #include "src/unique.h"
@@ skipping 153 matching lines @@
   static bool Equals(int a, int b) { return a == b; }
 };
 
 // Specialization for static parameters of type {double}.
 template <>
 struct StaticParameterTraits<double> {
   static OStream& PrintTo(OStream& os, double val) {  // NOLINT
     return os << val;
   }
   static int HashCode(double a) {
-    return static_cast<int>(BitCast<int64_t>(a));
+    return static_cast<int>(bit_cast<int64_t>(a));
   }
   static bool Equals(double a, double b) {
-    return BitCast<int64_t>(a) == BitCast<int64_t>(b);
+    return bit_cast<int64_t>(a) == bit_cast<int64_t>(b);
   }
 };
 
 // Specialization for static parameters of type {Unique<Object>}.
 template <>
 struct StaticParameterTraits<Unique<Object> > {
   static OStream& PrintTo(OStream& os, Unique<Object> val) {  // NOLINT
     return os << Brief(*val.handle());
   }
   static int HashCode(Unique<Object> a) {
@@ skipping 80 matching lines @@
 template <typename T>
 static inline T OpParameter(const Operator* op) {
   return reinterpret_cast<const Operator1<T>*>(op)->parameter();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPERATOR_H_