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

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/bytecode-graph-builder.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compilation-info.h"
 #include "src/compiler/compiler-source-position-table.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
+#include "src/compiler/simplified-operator.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // The abstract execution environment simulates the content of the interpreter
 // register file. The environment performs SSA-renaming of all tracked nodes at
 // split and merge points in the control flow.
@@ skipping 1606 matching lines @@
 }
 
 void BytecodeGraphBuilder::VisitTestIn() {
   BuildCompareOp(javascript()->HasProperty());
 }
 
 void BytecodeGraphBuilder::VisitTestInstanceOf() {
   BuildCompareOp(javascript()->InstanceOf());
 }
 
+void BytecodeGraphBuilder::VisitTestUndetectable() {
+  Node* object =
+      environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
+  Node* node = NewNode(jsgraph()->simplified()->ObjectIsUndetectable(), object);
+  environment()->BindAccumulator(node);
+}
+
 void BytecodeGraphBuilder::BuildCastOperator(const Operator* js_op) {
   PrepareEagerCheckpoint();
   Node* value = NewNode(js_op, environment()->LookupAccumulator());
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0), value,
                               Environment::kAttachFrameState);
 }
 
 void BytecodeGraphBuilder::VisitToName() {
   BuildCastOperator(javascript()->ToName());
 }
@@ skipping 541 matching lines @@
         it->source_position().ScriptOffset(), start_position_.InliningId()));
     it->Advance();
   } else {
     DCHECK_GT(it->code_offset(), offset);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8