MIPS: Fix big-endian after r21774/r21803.

include/v8.h

 // Copyright 2012 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5499 matching lines @@
 /**
  * This class exports constants and functionality from within v8 that
  * is necessary to implement inline functions in the v8 api.  Don't
  * depend on functions and constants defined here.
  */
 class Internals {
  public:
   // These values match non-compiler-dependent values defined within
   // the implementation of v8.
   static const int kHeapObjectMapOffset = 0;
+#if defined (__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)

[mtbrandy, 2014/06/17 17:11:39]

I think this is an argument for making the v8-endian definitions available here 
similar to the v8-os definitions.  Not all platforms define __BYTE_ORDER__.

[danno, 2014/06/18 11:18:41]

This probably means taking the entire contents of src/base/build_config.h and
putting it in v8config.h. Adding Jochen to see how that fits into his master
plan for refactoring base.

[Paul Lind, 2014/06/19 07:31:22]

By loading 16 bit word in this API accessor, but only using the LS 8 bits
(InstanceType), we can take advantage of the endianess, as Danno did in r21774.
And avoid conditional compilation here.

I think it would be good for the future to bring base/build_config.h into
v8config.h, or at least the CPU arch & endianess part of it, but we don't need
to do it for this issue.

+  static const int kMapInstanceTypeOffset =
+      1 * kApiPointerSize + kApiIntSize + 1;
+#else
   static const int kMapInstanceTypeOffset = 1 * kApiPointerSize + kApiIntSize;
+#endif
   static const int kStringResourceOffset = 3 * kApiPointerSize;
 
   static const int kOddballKindOffset = 3 * kApiPointerSize;
   static const int kForeignAddressOffset = kApiPointerSize;
   static const int kJSObjectHeaderSize = 3 * kApiPointerSize;
   static const int kFixedArrayHeaderSize = 2 * kApiPointerSize;
   static const int kContextHeaderSize = 2 * kApiPointerSize;
   static const int kContextEmbedderDataIndex = 76;
   static const int kFullStringRepresentationMask = 0x07;
   static const int kStringEncodingMask = 0x4;
@@ skipping 1123 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_