Support fast case for-in in Crankshaft.

src/x64/lithium-x64.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 2251 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoIn(HIn* instr) {
   LOperand* key = UseOrConstantAtStart(instr->key());
   LOperand* object = UseOrConstantAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, rax), instr);
 }
 
 
+LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
+  LOperand* object = UseFixed(instr->enumerable(), rax);
+  LForInPrepareMap* result = new LForInPrepareMap(object);
+  return MarkAsCall(DefineFixed(result, rax), instr, CAN_DEOPTIMIZE_EAGERLY);
+}
+
+
+LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
+  LOperand* map = UseRegister(instr->map());
+  return AssignEnvironment(DefineAsRegister(
+      new LForInCacheArray(map)));
+}
+
+
+LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
+  LOperand* value = UseRegisterAtStart(instr->value());
+  LOperand* map = UseRegisterAtStart(instr->map());
+  return AssignEnvironment(new LCheckMapValue(value, map));
+}
+
+
+LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
+  LOperand* object = UseRegister(instr->object());
+  LOperand* index = UseTempRegister(instr->index());
+  return DefineSameAsFirst(new LLoadFieldByIndex(object, index));
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64