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

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 22ceb138e31898c7fb5c10824658d5eed0ce14a2..30e27fa545e890d2063622b200a3afc274a660cd 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -249,6 +249,9 @@ namespace interpreter {
   V(JumpIfUndefined, OperandType::kImm8)                                       \
   V(JumpIfUndefinedConstant, OperandType::kIdx8)                               \
   V(JumpIfUndefinedConstantWide, OperandType::kIdx16)                          \
+  /* TODO(mythria): Replace with opcodes that throw on a hole */               \
+  V(JumpIfHole, OperandType::kImm8)                                            \
+  V(JumpIfNotHole, OperandType::kImm8)                                         \
                                                                                \
   /* Complex flow control For..in */                                           \
   V(ForInPrepare, OperandType::kRegOutTriple8)                                 \