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

test/cctest/interpreter/bytecode_expectations/ForOf.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: yes
 
 ---
 snippet: "
   for (var p of [0, 1, 2]) {}
 "
 frame size: 15
 parameter count: 1
-bytecode array length: 268
+bytecode array length: 266
 bytecodes: [
   /*   30 E> */ B(StackCheck),
                 B(LdaZero),
                 B(Star), R(4),
                 B(Mov), R(context), R(11),
                 B(Mov), R(context), R(12),
   /*   48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(9),
                 B(Star), R(14),
                 B(LdaConstant), U8(1),
   /*   48 E> */ B(LdaKeyedProperty), R(14), U8(4),
@@ skipping 39 matching lines @@
                 B(Star), R(9),
                 B(Jump), U8(7),
                 B(Star), R(10),
                 B(LdaZero),
                 B(Star), R(9),
                 B(LdaTheHole),
                 B(SetPendingMessage),
                 B(Star), R(11),
                 B(LdaZero),
                 B(TestEqualStrict), R(4), U8(15),
-                B(JumpIfTrue), U8(113),
+                B(JumpIfTrue), U8(111),
                 B(LdaNamedProperty), R(2), U8(7), U8(16),
                 B(Star), R(6),
-                B(LdaNull),
-                B(TestEqual), R(6), U8(18),
+                B(TestUndetectable), R(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(99),
                 B(LdaSmi), U8(1),
                 B(TestEqualStrict), R(4), U8(19),
                 B(JumpIfFalse), U8(67),
                 B(Ldar), R(6),
                 B(TypeOf),
                 B(Star), R(12),
                 B(LdaConstant), U8(8),
                 B(TestEqualStrict), R(12), U8(20),
@@ skipping 48 matching lines @@
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
   FIXED_ARRAY_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["function"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [""],
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
   [7, 120, 126],
   [10, 84, 86],
-  [195, 205, 207],
+  [193, 203, 205],
 ]
 
 ---
 snippet: "
   var x = 'potatoes';
   for (var p of x) { return p; }
 "
 frame size: 16
 parameter count: 1
-bytecode array length: 279
+bytecode array length: 277
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
                 B(LdaZero),
                 B(Star), R(5),
                 B(Mov), R(context), R(12),
                 B(Mov), R(context), R(13),
   /*   68 S> */ B(LdaConstant), U8(1),
   /*   68 E> */ B(LdaKeyedProperty), R(0), U8(4),
@@ skipping 40 matching lines @@
                 B(Star), R(10),
                 B(Jump), U8(8),
                 B(Star), R(11),
                 B(LdaSmi), U8(1),
                 B(Star), R(10),
                 B(LdaTheHole),
                 B(SetPendingMessage),
                 B(Star), R(12),
                 B(LdaZero),
                 B(TestEqualStrict), R(5), U8(15),
-                B(JumpIfTrue), U8(113),
+                B(JumpIfTrue), U8(111),
                 B(LdaNamedProperty), R(3), U8(7), U8(16),
                 B(Star), R(7),
-                B(LdaNull),
-                B(TestEqual), R(7), U8(18),
+                B(TestUndetectable), R(7),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(99),
                 B(LdaSmi), U8(1),
                 B(TestEqualStrict), R(5), U8(19),
                 B(JumpIfFalse), U8(67),
                 B(Ldar), R(7),
                 B(TypeOf),
                 B(Star), R(13),
                 B(LdaConstant), U8(8),
                 B(TestEqualStrict), R(13), U8(20),
@@ skipping 53 matching lines @@
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
   FIXED_ARRAY_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["function"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [""],
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
   [11, 120, 126],
   [14, 84, 86],
-  [196, 206, 208],
+  [194, 204, 206],
 ]
 
 ---
 snippet: "
   for (var x of [10, 20, 30]) {
     if (x == 10) continue;
     if (x == 20) break;
   }
 "
 frame size: 15
 parameter count: 1
-bytecode array length: 286
+bytecode array length: 284
 bytecodes: [
   /*   30 E> */ B(StackCheck),
                 B(LdaZero),
                 B(Star), R(4),
                 B(Mov), R(context), R(11),
                 B(Mov), R(context), R(12),
   /*   48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(9),
                 B(Star), R(14),
                 B(LdaConstant), U8(1),
   /*   48 E> */ B(LdaKeyedProperty), R(14), U8(4),
@@ skipping 47 matching lines @@
                 B(Star), R(9),
                 B(Jump), U8(7),
                 B(Star), R(10),
                 B(LdaZero),
                 B(Star), R(9),
                 B(LdaTheHole),
                 B(SetPendingMessage),
                 B(Star), R(11),
                 B(LdaZero),
                 B(TestEqualStrict), R(4), U8(17),
-                B(JumpIfTrue), U8(113),
+                B(JumpIfTrue), U8(111),
                 B(LdaNamedProperty), R(2), U8(7), U8(18),
                 B(Star), R(6),
-                B(LdaNull),
-                B(TestEqual), R(6), U8(20),
+                B(TestUndetectable), R(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(99),
                 B(LdaSmi), U8(1),
                 B(TestEqualStrict), R(4), U8(21),
                 B(JumpIfFalse), U8(67),
                 B(Ldar), R(6),
                 B(TypeOf),
                 B(Star), R(12),
                 B(LdaConstant), U8(8),
                 B(TestEqualStrict), R(12), U8(22),
@@ skipping 48 matching lines @@
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
   FIXED_ARRAY_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["function"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [""],
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
   [7, 138, 144],
   [10, 102, 104],
-  [213, 223, 225],
+  [211, 221, 223],
 ]
 
 ---
 snippet: "
   var x = { 'a': 1, 'b': 2 };
   for (x['a'] of [1,2,3]) { return x['a']; }
 "
 frame size: 14
 parameter count: 1
-bytecode array length: 293
+bytecode array length: 291
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(8),
                 B(Mov), R(8), R(0),
                 B(LdaZero),
                 B(Star), R(3),
                 B(Mov), R(context), R(10),
                 B(Mov), R(context), R(11),
   /*   77 S> */ B(CreateArrayLiteral), U8(1), U8(1), U8(9),
                 B(Star), R(13),
@@ skipping 44 matching lines @@
                 B(Star), R(8),
                 B(Jump), U8(8),
                 B(Star), R(9),
                 B(LdaSmi), U8(1),
                 B(Star), R(8),
                 B(LdaTheHole),
                 B(SetPendingMessage),
                 B(Star), R(10),
                 B(LdaZero),
                 B(TestEqualStrict), R(3), U8(19),
-                B(JumpIfTrue), U8(113),
+                B(JumpIfTrue), U8(111),
                 B(LdaNamedProperty), R(1), U8(9), U8(20),
                 B(Star), R(5),
-                B(LdaNull),
-                B(TestEqual), R(5), U8(22),
+                B(TestUndetectable), R(5),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(99),
                 B(LdaSmi), U8(1),
                 B(TestEqualStrict), R(3), U8(23),
                 B(JumpIfFalse), U8(67),
                 B(Ldar), R(5),
                 B(TypeOf),
                 B(Star), R(11),
                 B(LdaConstant), U8(10),
                 B(TestEqualStrict), R(11), U8(24),
@@ skipping 55 matching lines @@
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
   FIXED_ARRAY_TYPE,
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["function"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [""],
   FIXED_ARRAY_TYPE,
 ]
 handlers: [
   [15, 134, 140],
   [18, 98, 100],
-  [210, 220, 222],
+  [208, 218, 220],
 ]