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

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 865 matching lines @@
 
 
 // -----------------------------------------------------------------------------
 // Implementation of ExternalReference
 
 void ExternalReference::SetUp() {
   double_constants.min_int = kMinInt;
   double_constants.one_half = 0.5;
   double_constants.minus_one_half = -0.5;
   double_constants.canonical_non_hole_nan = base::OS::nan_value();
-  double_constants.the_hole_nan = BitCast<double>(kHoleNanInt64);
+  double_constants.the_hole_nan = bit_cast<double>(kHoleNanInt64);
   double_constants.negative_infinity = -V8_INFINITY;
   double_constants.uint32_bias =
     static_cast<double>(static_cast<uint32_t>(0xFFFFFFFF)) + 1;
 
   math_exp_data_mutex = new base::Mutex();
 }
 
 
 void ExternalReference::InitializeMathExpData() {
   // Early return?
@@ skipping 20 matching lines @@
     math_exp_constants_array[4] =
         static_cast<double>(static_cast<int64_t>(3) << 51);
     math_exp_constants_array[5] = 1 / constant3;
     math_exp_constants_array[6] = 3.0000000027955394;
     math_exp_constants_array[7] = 0.16666666685227835;
     math_exp_constants_array[8] = 1;
 
     math_exp_log_table_array = new double[kTableSize];
     for (int i = 0; i < kTableSize; i++) {
       double value = std::pow(2, i / kTableSizeDouble);
-      uint64_t bits = BitCast<uint64_t, double>(value);
+      uint64_t bits = bit_cast<uint64_t, double>(value);
       bits &= (static_cast<uint64_t>(1) << 52) - 1;
-      double mantissa = BitCast<double, uint64_t>(bits);
+      double mantissa = bit_cast<double, uint64_t>(bits);
       math_exp_log_table_array[i] = mantissa;
     }
 
     math_exp_data_initialized = true;
   }
 }
 
 
 void ExternalReference::TearDownMathExpData() {
   delete[] math_exp_constants_array;
@@ skipping 625 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal