[Interpreter] Optimize equality check with null/undefined with a check on the map.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 24081b9535f0d9fa781c56af47070a3f8a0f21a3..96eee426c247305d2e03bb7b224b75b7b50d0c3c 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -889,6 +889,13 @@ Reduction JSTypedLowering::ReduceJSEqual(Node* node, bool invert) {
   return NoChange();
 }
 
+Reduction JSTypedLowering::ReduceJSIsUndetectable(Node* node) {
+  // ObjectIsUndetectable does not need a context input. So remove it.
+  node->TrimInputCount(1);
+  NodeProperties::ChangeOp(node, simplified()->ObjectIsUndetectable());
+  return Changed(node);
+}
+
 Reduction JSTypedLowering::ReduceJSStrictEqual(Node* node, bool invert) {
   JSBinopReduction r(this, node);
   if (r.left() == r.right()) {
@@ -2209,6 +2216,8 @@ Reduction JSTypedLowering::Reduce(Node* node) {
       return ReduceJSEqual(node, true);
     case IrOpcode::kJSStrictEqual:
       return ReduceJSStrictEqual(node, false);
+    case IrOpcode::kJSIsUndetectable:
+      return ReduceJSIsUndetectable(node);
     case IrOpcode::kJSStrictNotEqual:
       return ReduceJSStrictEqual(node, true);
     case IrOpcode::kJSLessThan:         // fall through