[Interpreter] Add ForOf support.

src/interpreter/bytecode-generator.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/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/control-flow-builders.h"
@@ skipping 876 matching lines @@
   builder()->StoreAccumulatorInRegister(index);
   loop_builder.JumpToHeader();
   loop_builder.EndLoop();
   builder()->Bind(&not_object_label);
   builder()->Bind(&subject_null_label);
   builder()->Bind(&subject_undefined_label);
 }
 
 
 void BytecodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
-  UNIMPLEMENTED();
+  LoopBuilder loop_builder(builder());
+  ControlScopeForIteration control_scope(this, stmt, &loop_builder);
+
+  VisitForEffect(stmt->assign_iterator());
+
+  loop_builder.LoopHeader();
+  loop_builder.Next();
+  VisitForEffect(stmt->next_result());
+  VisitForAccumulatorValue(stmt->result_done());
+  loop_builder.BreakIfTrue();
+
+  VisitForEffect(stmt->assign_each());
+  Visit(stmt->body());
+  loop_builder.JumpToHeader();
+  loop_builder.EndLoop();
 }
 
 
 void BytecodeGenerator::VisitTryCatchStatement(TryCatchStatement* stmt) {
   TryCatchBuilder try_control_builder(builder());
 
   // Preserve the context in a dedicated register, so that it can be restored
   // when the handler is entered by the stack-unwinding machinery.
   // TODO(mstarzinger): Be smarter about register allocation.
   Register context = register_allocator()->NewRegister();
@@ skipping 1370 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8