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

src/compiler/instruction.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 640 matching lines @@
   SourcePosition source_position_;
 };
 
 
 class Constant FINAL {
  public:
   enum Type { kInt32, kInt64, kFloat64, kExternalReference, kHeapObject };
 
   explicit Constant(int32_t v) : type_(kInt32), value_(v) {}
   explicit Constant(int64_t v) : type_(kInt64), value_(v) {}
-  explicit Constant(double v) : type_(kFloat64), value_(BitCast<int64_t>(v)) {}
+  explicit Constant(double v) : type_(kFloat64), value_(bit_cast<int64_t>(v)) {}
   explicit Constant(ExternalReference ref)
-      : type_(kExternalReference), value_(BitCast<intptr_t>(ref)) {}
+      : type_(kExternalReference), value_(bit_cast<intptr_t>(ref)) {}
   explicit Constant(Handle<HeapObject> obj)
-      : type_(kHeapObject), value_(BitCast<intptr_t>(obj)) {}
+      : type_(kHeapObject), value_(bit_cast<intptr_t>(obj)) {}
 
   Type type() const { return type_; }
 
   int32_t ToInt32() const {
     DCHECK_EQ(kInt32, type());
     return static_cast<int32_t>(value_);
   }
 
   int64_t ToInt64() const {
     if (type() == kInt32) return ToInt32();
     DCHECK_EQ(kInt64, type());
     return value_;
   }
 
   double ToFloat64() const {
     if (type() == kInt32) return ToInt32();
     DCHECK_EQ(kFloat64, type());
-    return BitCast<double>(value_);
+    return bit_cast<double>(value_);
   }
 
   ExternalReference ToExternalReference() const {
     DCHECK_EQ(kExternalReference, type());
-    return BitCast<ExternalReference>(static_cast<intptr_t>(value_));
+    return bit_cast<ExternalReference>(static_cast<intptr_t>(value_));
   }
 
   Handle<HeapObject> ToHeapObject() const {
     DCHECK_EQ(kHeapObject, type());
-    return BitCast<Handle<HeapObject> >(static_cast<intptr_t>(value_));
+    return bit_cast<Handle<HeapObject> >(static_cast<intptr_t>(value_));
   }
 
  private:
   Type type_;
   int64_t value_;
 };
 
 
 class FrameStateDescriptor : public ZoneObject {
  public:
@@ skipping 198 matching lines @@
   DeoptimizationVector deoptimization_entries_;
 };
 
 OStream& operator<<(OStream& os, const InstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_