Fix field type handling in load elimination.

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 5172 matching lines @@
   Register reg = ToRegister(input);
 
   __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
 
   DeferredCheckMaps* deferred = NULL;
   if (instr->hydrogen()->has_migration_target()) {
     deferred = new(zone()) DeferredCheckMaps(this, instr, reg);
     __ bind(deferred->check_maps());
   }
 
-  UniqueSet<Map> map_set = instr->hydrogen()->map_set();
+  const UniqueSet<Map>* map_set = instr->hydrogen()->map_set();
   Label success;
-  for (int i = 0; i < map_set.size() - 1; i++) {
-    Handle<Map> map = map_set.at(i).handle();
+  for (int i = 0; i < map_set->size() - 1; i++) {
+    Handle<Map> map = map_set->at(i).handle();
     __ CompareMap(map_reg, map, &success);
     __ b(eq, &success);
   }
 
-  Handle<Map> map = map_set.at(map_set.size() - 1).handle();
+  Handle<Map> map = map_set->at(map_set->size() - 1).handle();
   __ CompareMap(map_reg, map, &success);
   if (instr->hydrogen()->has_migration_target()) {
     __ b(ne, deferred->entry());
   } else {
     DeoptimizeIf(ne, instr->environment());
   }
 
   __ bind(&success);
 }
 
@@ skipping 652 matching lines @@
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal