[turbofan] Make MachineType a pair of enums.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index 149c663fa927f3f612661510481664d75cac1dda..5c6b52557d69606020b2219efedc6bd2931488dd 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -357,7 +357,7 @@ TEST_F(JSTypedLoweringTest, JSToObjectWithAny) {
   Reduction r = Reduce(graph()->NewNode(javascript()->ToObject(), input,
                                         context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsPhi(kMachAnyTagged, _, _, _));
+  EXPECT_THAT(r.replacement(), IsPhi(MachineRepresentation::kTagged, _, _, _));
 }
 
 
@@ -387,10 +387,10 @@ TEST_F(JSTypedLoweringTest, JSToStringWithBoolean) {
   Reduction r = Reduce(graph()->NewNode(javascript()->ToString(), input,
                                         context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(
-      r.replacement(),
-      IsSelect(kMachAnyTagged, input, IsHeapConstant(factory()->true_string()),
-               IsHeapConstant(factory()->false_string())));
+  EXPECT_THAT(r.replacement(),
+              IsSelect(MachineRepresentation::kTagged, input,
+                       IsHeapConstant(factory()->true_string()),
+                       IsHeapConstant(factory()->false_string())));
 }