[turbofan] Correctify representation changes to bit.

test/unittests/compiler/change-lowering-unittest.cc

Index: test/unittests/compiler/change-lowering-unittest.cc
diff --git a/test/unittests/compiler/change-lowering-unittest.cc b/test/unittests/compiler/change-lowering-unittest.cc
index 060b1c1842fb663a1a598923297cc5c962e29599..82e262f401a80a135386d6e9ecdc1200468734d0 100644
--- a/test/unittests/compiler/change-lowering-unittest.cc
+++ b/test/unittests/compiler/change-lowering-unittest.cc
@@ -132,11 +132,32 @@ TARGET_TEST_P(ChangeLoweringCommonTest, ChangeBoolToBit) {
   Node* node = graph()->NewNode(simplified()->ChangeBoolToBit(), val);
   Reduction reduction = Reduce(node);
   ASSERT_TRUE(reduction.Changed());
-
   EXPECT_THAT(reduction.replacement(), IsWordEqual(val, IsTrueConstant()));
 }
 
 
+TARGET_TEST_P(ChangeLoweringCommonTest, ChangeWord32ToBit) {
+  Node* val = Parameter(0);
+  Node* node = graph()->NewNode(simplified()->ChangeWord32ToBit(), val);
+  Reduction reduction = Reduce(node);
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_THAT(reduction.replacement(),
+              IsWord32Equal(IsWord32Equal(val, IsInt32Constant(0)),
+                            IsInt32Constant(0)));
+}
+
+
+TARGET_TEST_P(ChangeLoweringCommonTest, ChangeWord64ToBit) {
+  Node* val = Parameter(0);
+  Node* node = graph()->NewNode(simplified()->ChangeWord64ToBit(), val);
+  Reduction reduction = Reduce(node);
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_THAT(reduction.replacement(),
+              IsWord32Equal(IsWord64Equal(val, IsInt64Constant(0)),
+                            IsInt32Constant(0)));
+}
+
+
 TARGET_TEST_P(ChangeLoweringCommonTest, ChangeFloat64ToTagged) {
   Node* val = Parameter(0);
   Node* node = graph()->NewNode(simplified()->ChangeFloat64ToTagged(), val);