[Interpreter] Transform StrictEquality with null/undefined to special bytecodes.

test/cctest/interpreter/test-bytecode-generator.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 <fstream>
 
 #include "src/v8.h"
 
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-generator.h"
@@ skipping 1732 matching lines @@
 }
 
 TEST(GenerateTestUndetectable) {
   InitializedIgnitionHandleScope scope;
   BytecodeExpectationsPrinter printer(CcTest::isolate());
   const char* snippets[] = {
       "var obj_a = {val:1};\n"
       "var b = 10;\n"
       "if (obj_a == null) { b = 20;}\n"
       "return b;\n",
+
       "var obj_a = {val:1};\n"
       "var b = 10;\n"
       "if (obj_a == undefined) { b = 20;}\n"
       "return b;\n",
+
       "var obj_a = {val:1};\n"
       "var b = 10;\n"
       "if (obj_a != null) { b = 20;}\n"
       "return b;\n",
+
       "var obj_a = {val:1};\n"
       "var b = 10;\n"
       "if (obj_a != undefined) { b = 20;}\n"
+      "return b;\n",
+
+      "var obj_a = {val:1};\n"
+      "var b = 10;\n"
+      "if (obj_a === null) { b = 20;}\n"
+      "return b;\n",
+
+      "var obj_a = {val:1};\n"
+      "var b = 10;\n"
+      "if (obj_a === undefined) { b = 20;}\n"
+      "return b;\n",
+
+      "var obj_a = {val:1};\n"
+      "var b = 10;\n"
+      "if (obj_a !== null) { b = 20;}\n"
+      "return b;\n",
+
+      "var obj_a = {val:1};\n"
+      "var b = 10;\n"
+      "if (obj_a !== undefined) { b = 20;}\n"
       "return b;\n"};
 
   CHECK(CompareTexts(BuildActual(printer, snippets),
                      LoadGolden("GenerateTestUndetectable.golden")));
 }
 
 TEST(AssignmentsInBinaryExpression) {
   InitializedIgnitionHandleScope scope;
   BytecodeExpectationsPrinter printer(CcTest::isolate());
   const char* snippets[] = {
@@ skipping 538 matching lines @@
       "})();\n",
   };
 
   CHECK(CompareTexts(BuildActual(printer, snippets),
                      LoadGolden("SuperCallAndSpread.golden")));
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8