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;
-  static const int kMapInstanceTypeOffset = 1 * kApiPointerSize + kApiIntSize;
+  static const int kMapInstanceTypeAndBitFieldOffset =
+      1 * kApiPointerSize + kApiIntSize;
   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 57 matching lines @@
     return PlatformSmiTagging::IntToSmi(value);
   }
 
   V8_INLINE static bool IsValidSmi(intptr_t value) {
     return PlatformSmiTagging::IsValidSmi(value);
   }
 
   V8_INLINE static int GetInstanceType(internal::Object* obj) {
     typedef internal::Object O;
     O* map = ReadField<O*>(obj, kHeapObjectMapOffset);
-    return ReadField<uint8_t>(map, kMapInstanceTypeOffset);
+    // Map::InstanceType is defined so that it will always be loaded into
+    // the LS 8 bits of one 16-bit word, regardless of endianess.
+    return ReadField<uint16_t>(map, kMapInstanceTypeAndBitFieldOffset) & 0xff;
   }
 
   V8_INLINE static int GetOddballKind(internal::Object* obj) {
     typedef internal::Object O;
     return SmiValue(ReadField<O*>(obj, kOddballKindOffset));
   }
 
   V8_INLINE static bool IsExternalTwoByteString(int instance_type) {
     int representation = (instance_type & kFullStringRepresentationMask);
     return representation == kExternalTwoByteRepresentationTag;
@@ skipping 1045 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_