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

test/cctest/interpreter/bytecode_expectations/GenerateTestUndetectable.golden

Index: test/cctest/interpreter/bytecode_expectations/GenerateTestUndetectable.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/GenerateTestUndetectable.golden b/test/cctest/interpreter/bytecode_expectations/GenerateTestUndetectable.golden
new file mode 100644
index 0000000000000000000000000000000000000000..51c9c3ab4ce2888f8625a617d54c2c622603bd72
--- /dev/null
+++ b/test/cctest/interpreter/bytecode_expectations/GenerateTestUndetectable.golden
@@ -0,0 +1,123 @@
+#
+# Autogenerated by generate-bytecode-expectations.
+#
+
+---
+wrap: yes
+
+---
+snippet: "
+  var obj_a = {val:1};
+  var b = 10;
+  if (obj_a == null) { b = 20;}
+  return b;
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 24
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
+                B(Mov), R(2), R(0),
+  /*   63 S> */ B(LdaSmi), U8(10),
+                B(Star), R(1),
+  /*   67 S> */ B(TestUndetectable), R(0),
+                B(JumpIfFalse), U8(6),
+  /*   88 S> */ B(LdaSmi), U8(20),
+                B(Star), R(1),
+  /*   97 S> */ B(Ldar), R(1),
+  /*  107 S> */ B(Return),
+]
+constant pool: [
+  FIXED_ARRAY_TYPE,
+]
+handlers: [
+]
+
+---
+snippet: "
+  var obj_a = {val:1};
+  var b = 10;
+  if (obj_a == undefined) { b = 20;}
+  return b;
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 24
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
+                B(Mov), R(2), R(0),
+  /*   63 S> */ B(LdaSmi), U8(10),
+                B(Star), R(1),
+  /*   67 S> */ B(TestUndetectable), R(0),
+                B(JumpIfFalse), U8(6),
+  /*   93 S> */ B(LdaSmi), U8(20),
+                B(Star), R(1),
+  /*  102 S> */ B(Ldar), R(1),
+  /*  112 S> */ B(Return),
+]
+constant pool: [
+  FIXED_ARRAY_TYPE,
+]
+handlers: [
+]
+
+---
+snippet: "
+  var obj_a = {val:1};
+  var b = 10;
+  if (obj_a != null) { b = 20;}
+  return b;
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 24
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
+                B(Mov), R(2), R(0),
+  /*   63 S> */ B(LdaSmi), U8(10),
+                B(Star), R(1),
+  /*   67 S> */ B(TestUndetectable), R(0),
+                B(JumpIfTrue), U8(6),
+  /*   88 S> */ B(LdaSmi), U8(20),
+                B(Star), R(1),
+  /*   97 S> */ B(Ldar), R(1),
+  /*  107 S> */ B(Return),
+]
+constant pool: [
+  FIXED_ARRAY_TYPE,
+]
+handlers: [
+]
+
+---
+snippet: "
+  var obj_a = {val:1};
+  var b = 10;
+  if (obj_a != undefined) { b = 20;}
+  return b;
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 24
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   46 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(2),
+                B(Mov), R(2), R(0),
+  /*   63 S> */ B(LdaSmi), U8(10),
+                B(Star), R(1),
+  /*   67 S> */ B(TestUndetectable), R(0),
+                B(JumpIfTrue), U8(6),
+  /*   93 S> */ B(LdaSmi), U8(20),
+                B(Star), R(1),
+  /*  102 S> */ B(Ldar), R(1),
+  /*  112 S> */ B(Return),
+]
+constant pool: [
+  FIXED_ARRAY_TYPE,
+]
+handlers: [
+]
+