Enable code optimization on ARM.

runtime/vm/deopt_instructions.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/deopt_instructions.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/intermediate_language.h"
 #include "vm/locations.h"
@@ skipping 724 matching lines @@
   return DeoptSuffixInstr::SuffixLength::decode(from_index);
 }
 
 
 uword DeoptInstr::GetRetAddress(DeoptInstr* instr,
                                 const Array& object_table,
                                 Function* func) {
   ASSERT(instr->kind() == kRetAddress);
   DeoptRetAddressInstr* ret_address_instr =
       static_cast<DeoptRetAddressInstr*>(instr);
+  // TODO(regis): The following assert may trigger when displaying a backtrace
+  // from the simulator.
   ASSERT(Isolate::IsDeoptAfter(ret_address_instr->deopt_id()));
   ASSERT(!object_table.IsNull());
   ASSERT(func != NULL);
   *func ^= object_table.At(ret_address_instr->object_table_index());
   const Code& code = Code::Handle(func->unoptimized_code());
   ASSERT(!code.IsNull());
   uword res = code.GetPcForDeoptId(ret_address_instr->deopt_id(),
                                    PcDescriptors::kDeopt);
   ASSERT(res != 0);
   return res;
@@ skipping 339 matching lines @@
                           Smi* offset,
                           DeoptInfo* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart