Implement HChange support for Smis and use it in Load/StoreNameField

src/lithium-allocator.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 1039 matching lines @@
       // Some branch instructions (e.g. loops' back edges)
       // can potentially cause a GC so they have a pointer map.
       // By inserting a move we essentially create a copy of a
       // value which is invisible to PopulatePointerMaps(), because we store
       // it into a location different from the operand of a live range
       // covering a branch instruction.
       // Thus we need to manually record a pointer.
       LInstruction* branch =
           InstructionAt(cur_block->last_instruction_index());
       if (branch->HasPointerMap()) {
-        if (phi->representation().IsTagged()) {
+        if (phi->representation().IsSmiOrTagged()) {
           branch->pointer_map()->RecordPointer(phi_operand, zone());
         } else if (!phi->representation().IsDouble()) {
           branch->pointer_map()->RecordUntagged(phi_operand, zone());
         }
       }
     }
 
     LiveRange* live_range = LiveRangeFor(phi->id());
     LLabel* label = chunk_->GetLabel(phi->block()->block_id());
     label->GetOrCreateParallelMove(LGap::START, zone())->
@@ skipping 562 matching lines @@
     va_start(arguments, msg);
     OS::VPrint(msg, arguments);
     va_end(arguments);
   }
 }
 
 
 bool LAllocator::HasTaggedValue(int virtual_register) const {
   HValue* value = graph_->LookupValue(virtual_register);
   if (value == NULL) return false;
-  return value->representation().IsTagged();
+  return value->representation().IsSmiOrTagged();
 }
 
 
 RegisterKind LAllocator::RequiredRegisterKind(int virtual_register) const {
   if (virtual_register < first_artificial_register_) {
     HValue* value = graph_->LookupValue(virtual_register);
     if (value != NULL && value->representation().IsDouble()) {
       return DOUBLE_REGISTERS;
     }
   } else if (double_artificial_registers_.Contains(
@@ skipping 531 matching lines @@
     LiveRange* current = live_ranges()->at(i);
     if (current != NULL) current->Verify();
   }
 }
 
 
 #endif
 
 
 } }  // namespace v8::internal