[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 ba2247f120c55752d7e484e330f4dff596c85174..56976fda0406665eceac4a088c097ed659924906 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -1765,6 +1765,21 @@ void BytecodeGraphBuilder::VisitJumpIfUndefinedConstantWide(
   BuildJumpIfEqual(jsgraph()->UndefinedConstant());
 }
 
+void BytecodeGraphBuilder::VisitJumpIfHole(
+    const interpreter::BytecodeArrayIterator& iterator) {
+  BuildJumpIfEqual(jsgraph()->TheHoleConstant());
+}
+
+void BytecodeGraphBuilder::VisitJumpIfNotHole(
+    const interpreter::BytecodeArrayIterator& iterator) {
+  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(
     const interpreter::BytecodeArrayIterator& iterator) {