Move DescriptorArray into the map

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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 5286 matching lines @@
   Addu(t8, t8, Operand(length));
   sw(t8, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
 
   bind(&done);
 }
 
 
 void MacroAssembler::LoadInstanceDescriptors(Register map,
                                              Register descriptors,
                                              Register scratch) {
-  Register temp = descriptors;
-  lw(temp, FieldMemOperand(map, Map::kTransitionsOrBackPointerOffset));
-
-  Label ok, fail, load_from_back_pointer;
-  CheckMap(temp,
-           scratch,
-           isolate()->factory()->fixed_array_map(),
-           &fail,
-           DONT_DO_SMI_CHECK);
-  lw(descriptors, FieldMemOperand(temp, TransitionArray::kDescriptorsOffset));
-  jmp(&ok);
-
-  bind(&fail);
-  LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
-  Branch(&load_from_back_pointer, ne, temp, Operand(scratch));
-  LoadRoot(descriptors, Heap::kEmptyDescriptorArrayRootIndex);
-  jmp(&ok);
-
-  bind(&load_from_back_pointer);
-  lw(temp, FieldMemOperand(temp, Map::kTransitionsOrBackPointerOffset));
-  lw(descriptors, FieldMemOperand(temp, TransitionArray::kDescriptorsOffset));
-
-  bind(&ok);
+  lw(descriptors, FieldMemOperand(map, Map::kDescriptorsOffset));
 }
 
 
 void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
   lw(dst, FieldMemOperand(map, Map::kBitField3Offset));
   DecodeField<Map::NumberOfOwnDescriptorsBits>(dst);
 }
 
 
 void MacroAssembler::EnumLength(Register dst, Register map) {
@@ skipping 141 matching lines @@
        opcode == BGTZL);
   opcode = (cond == eq) ? BEQ : BNE;
   instr = (instr & ~kOpcodeMask) | opcode;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS