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

test/unittests/interpreter/bytecode-array-builder-unittest.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "test/unittests/test-utils.h"
@@ skipping 145 matching lines @@
 
   // Emit cast operator invocations.
   builder.CastAccumulatorToNumber()
       .CastAccumulatorToJSObject()
       .CastAccumulatorToName();
 
   // Emit control flow. Return must be the last instruction.
   BytecodeLabel start;
   builder.Bind(&start);
   // Short jumps with Imm8 operands
-  builder.Jump(&start).JumpIfNull(&start).JumpIfUndefined(&start);
+  builder.Jump(&start)
+      .JumpIfNull(&start)
+      .JumpIfUndefined(&start)
+      .JumpIfHole(&start)
+      .JumpIfNotHole(&start);
   // Perform an operation that returns boolean value to
   // generate JumpIfTrue/False
   builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
       .JumpIfTrue(&start)
       .CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
       .JumpIfFalse(&start);
   // Perform an operation that returns a non-boolean operation to
   // generate JumpIfToBooleanTrue/False.
   builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
       .JumpIfTrue(&start)
@@ skipping 474 matching lines @@
     iterator.Advance();
   }
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8