[turbofan] Remove special JSForInStep and JSForInDone.

src/interpreter/interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 2242 matching lines @@
 
     // Need to filter the {key} for the {receiver}.
     Node* context = __ GetContext();
     Callable callable = CodeFactory::ForInFilter(assembler->isolate());
     Node* result = __ CallStub(callable, context, key, receiver);
     __ SetAccumulator(result);
     __ Dispatch();
   }
 }
 
-// ForInDone <index> <cache_length>
+// ForInContinue <index> <cache_length>
 //
-// Returns true if the end of the enumerable properties has been reached.
-void Interpreter::DoForInDone(InterpreterAssembler* assembler) {
+// Returns false if the end of the enumerable properties has been reached.
+void Interpreter::DoForInContinue(InterpreterAssembler* assembler) {
   Node* index_reg = __ BytecodeOperandReg(0);
   Node* index = __ LoadRegister(index_reg);
   Node* cache_length_reg = __ BytecodeOperandReg(1);
   Node* cache_length = __ LoadRegister(cache_length_reg);
 
   // Check if {index} is at {cache_length} already.
   Label if_true(assembler), if_false(assembler), end(assembler);
   __ BranchIfWordEqual(index, cache_length, &if_true, &if_false);
   __ Bind(&if_true);
   {
+    __ SetAccumulator(__ BooleanConstant(false));
+    __ Goto(&end);
+  }
+  __ Bind(&if_false);
+  {
     __ SetAccumulator(__ BooleanConstant(true));
     __ Goto(&end);
   }
-  __ Bind(&if_false);
-  {
-    __ SetAccumulator(__ BooleanConstant(false));
-    __ Goto(&end);
-  }
   __ Bind(&end);
   __ Dispatch();
 }
 
 // ForInStep <index>
 //
 // Increments the loop counter in register |index| and stores the result
 // in the accumulator.
 void Interpreter::DoForInStep(InterpreterAssembler* assembler) {
   Node* index_reg = __ BytecodeOperandReg(0);
@@ skipping 91 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8