Reapply r18377 it was reverted due to the unrelated bug it surfaced.

runtime/vm/intermediate_language_arm.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/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 154 matching lines @@
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void StringFromCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
-intptr_t LoadIndexedInstr::ResultCid() const {
+CompileType* LoadIndexedInstr::ComputeInitialType() const {
   UNIMPLEMENTED();
-  return kDynamicCid;
+  return NULL;
 }
 
 
 Representation LoadIndexedInstr::representation() const {
   UNIMPLEMENTED();
   return kTagged;
 }
 
 
 LocationSummary* LoadIndexedInstr::MakeLocationSummary() const {
@@ skipping 558 matching lines @@
 
 
 void CreateClosureInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM