Fix issues with compiling V8 with LLVM Clang...

src/double.h

 // Copyright 2010 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 #ifndef V8_DOUBLE_H_
 #define V8_DOUBLE_H_
 
 #include "diy_fp.h"
 
 namespace v8 {
 namespace internal {
 
 // We assume that doubles and uint64_t have the same endianness.
-static uint64_t double_to_uint64(double d) { return bit_cast<uint64_t>(d); }
-static double uint64_to_double(uint64_t d64) { return bit_cast<double>(d64); }
+static uint64_t double_to_uint64(double d) { return BitCast<uint64_t>(d); }
+static double uint64_to_double(uint64_t d64) { return BitCast<double>(d64); }
 
 // Helper functions for doubles.
 class Double {
  public:
   static const uint64_t kSignMask = V8_2PART_UINT64_C(0x80000000, 00000000);
   static const uint64_t kExponentMask = V8_2PART_UINT64_C(0x7FF00000, 00000000);
   static const uint64_t kSignificandMask =
       V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
   static const uint64_t kHiddenBit = V8_2PART_UINT64_C(0x00100000, 00000000);
 
@@ skipping 111 matching lines @@
   static const int kSignificandSize = 52;  // Excludes the hidden bit.
   static const int kExponentBias = 0x3FF + kSignificandSize;
   static const int kDenormalExponent = -kExponentBias + 1;
 
   uint64_t d64_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_DOUBLE_H_