[Interpreter] Adds support for const/let variables to interpreter.

src/compiler/interpreter-assembler.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/compiler/interpreter-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 635 matching lines @@
   return IntPtrAdd(BytecodeOffset(), Int32Constant(delta));
 }
 
 
 Node* InterpreterAssembler::Advance(Node* delta) {
   return raw_assembler_->IntPtrAdd(BytecodeOffset(), delta);
 }
 
 void InterpreterAssembler::Jump(Node* delta) { DispatchTo(Advance(delta)); }
 
-void InterpreterAssembler::JumpIfWordEqual(Node* lhs, Node* rhs, Node* delta) {
+void InterpreterAssembler::JumpConditional(Node* condition, Node* delta) {
   RawMachineLabel match, no_match;
-  Node* condition = raw_assembler_->WordEqual(lhs, rhs);
   raw_assembler_->Branch(condition, &match, &no_match);
   raw_assembler_->Bind(&match);
   DispatchTo(Advance(delta));
   raw_assembler_->Bind(&no_match);
   Dispatch();
 }
 
+void InterpreterAssembler::JumpIfWordEqual(Node* lhs, Node* rhs, Node* delta) {
+  JumpConditional(raw_assembler_->WordEqual(lhs, rhs), delta);
+}
+
+void InterpreterAssembler::JumpIfWordNotEqual(Node* lhs, Node* rhs,
+                                              Node* delta) {
+  JumpConditional(raw_assembler_->WordNotEqual(lhs, rhs), delta);
+}
 
 void InterpreterAssembler::Dispatch() {
   DispatchTo(Advance(interpreter::Bytecodes::Size(bytecode_)));
 }
 
 
 void InterpreterAssembler::DispatchTo(Node* new_bytecode_offset) {
   if (FLAG_trace_ignition) {
     TraceBytecode(Runtime::kInterpreterTraceBytecodeExit);
   }
@@ skipping 72 matching lines @@
   return raw_assembler_->call_descriptor();
 }
 
 
 Zone* InterpreterAssembler::zone() { return raw_assembler_->zone(); }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8