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

src/compiler/simplified-operator-reducer-unittest.cc

 // 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.
 
 #include "src/compiler/graph-unittest.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/simplified-operator-reducer.h"
 #include "src/compiler/typer.h"
 #include "src/conversions.h"
@@ skipping 421 matching lines @@
   EXPECT_EQ(param0, reduction.replacement());
 }
 
 
 TEST_F(SimplifiedOperatorReducerTest, ChangeTaggedToUint32WithConstant) {
   TRACED_FOREACH(double, n, kFloat64Values) {
     Reduction reduction = Reduce(graph()->NewNode(
         simplified()->ChangeTaggedToUint32(), NumberConstant(n)));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(),
-                IsInt32Constant(BitCast<int32_t>(DoubleToUint32(n))));
+                IsInt32Constant(bit_cast<int32_t>(DoubleToUint32(n))));
   }
 }
 
 
 TEST_F(SimplifiedOperatorReducerTest, ChangeTaggedToUint32WithNaNConstant1) {
   Reduction reduction =
       Reduce(graph()->NewNode(simplified()->ChangeTaggedToUint32(),
                               NumberConstant(-base::OS::nan_value())));
   ASSERT_TRUE(reduction.Changed());
   EXPECT_THAT(reduction.replacement(), IsInt32Constant(0));
@@ skipping 10 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // ChangeUint32ToTagged
 
 
 TEST_F(SimplifiedOperatorReducerTest, ChangeUint32ToTagged) {
   TRACED_FOREACH(uint32_t, n, kUint32Values) {
     Reduction reduction =
         Reduce(graph()->NewNode(simplified()->ChangeUint32ToTagged(),
-                                Int32Constant(BitCast<int32_t>(n))));
+                                Int32Constant(bit_cast<int32_t>(n))));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(), IsNumberConstant(FastUI2D(n)));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8