Avoid handle dereference during graph optimization.

src/arm/lithium-codegen-arm.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 800 matching lines @@
       ? Deoptimizer::LAZY
       : Deoptimizer::EAGER;
   Address entry = Deoptimizer::GetDeoptimizationEntry(id, bailout_type);
   if (entry == NULL) {
     Abort("bailout was not prepared");
     return;
   }
 
   ASSERT(FLAG_deopt_every_n_times < 2);  // Other values not supported on ARM.
 
-  if (FLAG_deopt_every_n_times == 1 &&
-      info_->shared_info()->opt_count() == id) {
+  if (FLAG_deopt_every_n_times == 1 && info_->opt_count() == id) {
     __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
     return;
   }
 
   if (FLAG_trap_on_deopt) __ stop("trap_on_deopt", cc);
 
   bool needs_lazy_deopt = info()->IsStub();
   ASSERT(info()->IsStub() || frame_is_built_);
   if (cc == al && !needs_lazy_deopt) {
     __ Jump(entry, RelocInfo::RUNTIME_ENTRY);
@@ skipping 3668 matching lines @@
 }
 
 
 void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
   Register object_reg = ToRegister(instr->object());
   Register new_map_reg = ToRegister(instr->new_map_temp());
   Register scratch = scratch0();
 
   Handle<Map> from_map = instr->original_map();
   Handle<Map> to_map = instr->transitioned_map();
-  ElementsKind from_kind = from_map->elements_kind();
-  ElementsKind to_kind = to_map->elements_kind();
+  ElementsKind from_kind = instr->from_kind();
+  ElementsKind to_kind = instr->to_kind();
 
   Label not_applicable;
   __ ldr(scratch, FieldMemOperand(object_reg, HeapObject::kMapOffset));
   __ cmp(scratch, Operand(from_map));
   __ b(ne, &not_applicable);
   __ mov(new_map_reg, Operand(to_map));
 
   if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
     __ str(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
     // Write barrier.
@@ skipping 1578 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal