[Interpreter] Optimize code of the form 'if (x === undefined)'.

test/cctest/interpreter/bytecode_expectations/CompareNil.golden

Index: test/cctest/interpreter/bytecode_expectations/CompareNil.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/CompareNil.golden b/test/cctest/interpreter/bytecode_expectations/CompareNil.golden
new file mode 100644
index 0000000000000000000000000000000000000000..ffb61c525e6750219c4245b4e6fbeed97d276755
--- /dev/null
+++ b/test/cctest/interpreter/bytecode_expectations/CompareNil.golden
@@ -0,0 +1,289 @@
+#
+# Autogenerated by generate-bytecode-expectations.
+#
+
+---
+wrap: yes
+
+---
+snippet: "
+  var a = 1;
+  return a === null;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 7
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaSmi), I8(1),
+                B(Star), R(0),
+  /*   45 S> */ B(TestNull),
+  /*   64 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = undefined;
+  return undefined === a;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 6
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaUndefined),
+                B(Star), R(0),
+  /*   53 S> */ B(TestUndefined),
+  /*   77 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = undefined;
+  return undefined !== a;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 7
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaUndefined),
+                B(Star), R(0),
+  /*   53 S> */ B(TestUndefined),
+  /*   70 E> */ B(LogicalNot),
+  /*   77 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 2;
+  return a != null;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 8
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaSmi), I8(2),
+                B(Star), R(0),
+  /*   45 S> */ B(TestUndetectable),
+  /*   54 E> */ B(LogicalNot),
+  /*   63 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = undefined;
+  return undefined == a;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 6
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaUndefined),
+                B(Star), R(0),
+  /*   53 S> */ B(TestUndetectable),
+  /*   76 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = undefined;
+  return undefined === a ? 1 : 2;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 13
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaUndefined),
+                B(Star), R(0),
+  /*   53 S> */ B(JumpIfNotUndefined), U8(6),
+                B(LdaSmi), I8(1),
+                B(Jump), U8(4),
+                B(LdaSmi), I8(2),
+  /*   85 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 0;
+  return null == a ? 1 : 2;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 14
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaZero),
+                B(Star), R(0),
+  /*   45 S> */ B(TestUndetectable),
+  /*   57 E> */ B(JumpIfFalse), U8(6),
+                B(LdaSmi), I8(1),
+                B(Jump), U8(4),
+                B(LdaSmi), I8(2),
+  /*   71 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 0;
+  return undefined !== a ? 1 : 2;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 13
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaZero),
+                B(Star), R(0),
+  /*   45 S> */ B(JumpIfUndefined), U8(6),
+                B(LdaSmi), I8(1),
+                B(Jump), U8(4),
+                B(LdaSmi), I8(2),
+  /*   77 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 0;
+  return a === null ? 1 : 2;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 13
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaZero),
+                B(Star), R(0),
+  /*   45 S> */ B(JumpIfNotNull), U8(6),
+                B(LdaSmi), I8(1),
+                B(Jump), U8(4),
+                B(LdaSmi), I8(2),
+  /*   72 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 0;
+  if (a === null) {
+    return 1;
+  } else {
+    return 2;
+  }
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 14
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaZero),
+                B(Star), R(0),
+  /*   45 S> */ B(JumpIfNotNull), U8(5),
+  /*   65 S> */ B(LdaSmi), I8(1),
+  /*   98 S> */ B(Return),
+  /*   86 S> */ B(LdaSmi), I8(2),
+  /*   98 S> */ B(Return),
+                B(LdaUndefined),
+  /*   98 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = 0;
+  if (a != undefined) {
+    return 1;
+  }
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 12
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaZero),
+                B(Star), R(0),
+  /*   45 S> */ B(TestUndetectable),
+  /*   51 E> */ B(JumpIfTrue), U8(5),
+  /*   69 S> */ B(LdaSmi), I8(1),
+  /*   81 S> */ B(Return),
+                B(LdaUndefined),
+  /*   81 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  var a = undefined;
+  var b = 0;
+  while (a !== undefined) {
+    b++;
+  }
+"
+frame size: 2
+parameter count: 1
+bytecode array length: 23
+bytecodes: [
+  /*   30 E> */ B(StackCheck),
+  /*   42 S> */ B(LdaUndefined),
+                B(Star), R(0),
+  /*   61 S> */ B(LdaZero),
+                B(Star), R(1),
+  /*   73 S> */ B(Ldar), R(0),
+                B(JumpIfUndefined), U8(12),
+  /*   64 E> */ B(StackCheck),
+  /*   92 S> */ B(Ldar), R(1),
+                B(Inc), U8(5),
+                B(Star), R(1),
+                B(JumpLoop), U8(11), I8(0),
+                B(LdaUndefined),
+  /*   99 S> */ B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+