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

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index da8db271712a3e2421a6f505972d3eed71b55ffa..594330ac6517b4a20bbad7f506bc9ff517de3600 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -807,6 +807,8 @@ Bytecode BytecodeArrayBuilder::GetJumpWithToBoolean(Bytecode jump_bytecode) {
     case Bytecode::kJump:
     case Bytecode::kJumpIfNull:
     case Bytecode::kJumpIfUndefined:
+    case Bytecode::kJumpIfHole:
+    case Bytecode::kJumpIfNotHole:
       return jump_bytecode;
     case Bytecode::kJumpIfTrue:
       return Bytecode::kJumpIfToBooleanTrue;
@@ -969,6 +971,15 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::StackCheck() {
   return *this;
 }
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::JumpIfHole(BytecodeLabel* label) {
+  return OutputJump(Bytecode::kJumpIfHole, label);
+}
+
+BytecodeArrayBuilder& BytecodeArrayBuilder::JumpIfNotHole(
+    BytecodeLabel* label) {
+  return OutputJump(Bytecode::kJumpIfNotHole, label);
+}
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::Throw() {
   Output(Bytecode::kThrow);
   exit_seen_in_block_ = true;