MIPS: Fix rare random crashes in keyed store if element transition is needed.

src/mips64/codegen-mips64.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/codegen.h"
 #include "src/macro-assembler.h"
@@ skipping 625 matching lines @@
   __ RecordWriteField(receiver,
                       HeapObject::kMapOffset,
                       target_map,
                       scratch2,
                       kRAHasBeenSaved,
                       kDontSaveFPRegs,
                       OMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   // Replace receiver's backing store with newly created FixedDoubleArray.
   __ Daddu(scratch1, array, Operand(kHeapObjectTag));
-  __ sd(scratch1, FieldMemOperand(a2, JSObject::kElementsOffset));
+  __ sd(scratch1, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ RecordWriteField(receiver,
                       JSObject::kElementsOffset,
                       scratch1,
                       scratch2,
                       kRAHasBeenSaved,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
 
@@ skipping 492 matching lines @@
     patcher.masm()->nop();  // Pad the empty space.
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64