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

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 493778a823c1bb596925e4d0254b01b012738c7b..562be542eec454be208288fa01409dc0776cb39c 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -1543,6 +1543,20 @@ void BytecodeGraphBuilder::VisitJumpIfUndefinedConstantWide() {
   BuildJumpIfEqual(jsgraph()->UndefinedConstant());
 }
 
+void BytecodeGraphBuilder::VisitJumpIfHole() {
+  BuildJumpIfEqual(jsgraph()->TheHoleConstant());
+}
+
+void BytecodeGraphBuilder::VisitJumpIfNotHole() {
+  Node* accumulator = environment()->LookupAccumulator();
+  Node* condition = NewNode(javascript()->StrictEqual(), accumulator,
+                            jsgraph()->TheHoleConstant());
+  Node* node =
+      NewNode(common()->Select(MachineRepresentation::kTagged), condition,
+              jsgraph()->FalseConstant(), jsgraph()->TrueConstant());
+  BuildConditionalJump(node);
+}
+
 void BytecodeGraphBuilder::VisitReturn() {
   Node* control =
       NewNode(common()->Return(), environment()->LookupAccumulator());