[turbofan] Make MachineType a pair of enums.

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

Index: test/unittests/compiler/select-lowering-unittest.cc
diff --git a/test/unittests/compiler/select-lowering-unittest.cc b/test/unittests/compiler/select-lowering-unittest.cc
index 51efc83f87c2eb15d4d8f6edfe3ac3a7ef77a34b..43cfd8484a712e0ad84c721e746c71cd46a99989 100644
--- a/test/unittests/compiler/select-lowering-unittest.cc
+++ b/test/unittests/compiler/select-lowering-unittest.cc
@@ -34,7 +34,8 @@ TEST_F(SelectLoweringTest, SelectWithSameConditions) {
   Node* const p2 = Parameter(2);
   Node* const p3 = Parameter(3);
   Node* const p4 = Parameter(4);
-  Node* const s0 = graph()->NewNode(common()->Select(kMachInt32), p0, p1, p2);
+  Node* const s0 = graph()->NewNode(
+      common()->Select(MachineRepresentation::kWord32), p0, p1, p2);
 
   Capture<Node*> branch;
   Capture<Node*> merge;
@@ -44,26 +45,27 @@ TEST_F(SelectLoweringTest, SelectWithSameConditions) {
     EXPECT_THAT(
         r.replacement(),
         IsPhi(
-            kMachInt32, p1, p2,
+            MachineRepresentation::kWord32, p1, p2,
             AllOf(CaptureEq(&merge),
                   IsMerge(IsIfTrue(CaptureEq(&branch)),
                           IsIfFalse(AllOf(CaptureEq(&branch),
                                           IsBranch(p0, graph()->start())))))));
   }
   {
-    Reduction const r =
-        Reduce(graph()->NewNode(common()->Select(kMachInt32), p0, p3, p4));
+    Reduction const r = Reduce(graph()->NewNode(
+        common()->Select(MachineRepresentation::kWord32), p0, p3, p4));
     ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(), IsPhi(kMachInt32, p3, p4, CaptureEq(&merge)));
+    EXPECT_THAT(r.replacement(), IsPhi(MachineRepresentation::kWord32, p3, p4,
+                                       CaptureEq(&merge)));
   }
   {
     // We must not reuse the diamond if it is reachable from either else/then
     // values of the Select, because the resulting graph can not be scheduled.
-    Reduction const r =
-        Reduce(graph()->NewNode(common()->Select(kMachInt32), p0, s0, p0));
+    Reduction const r = Reduce(graph()->NewNode(
+        common()->Select(MachineRepresentation::kWord32), p0, s0, p0));
     ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(),
-                IsPhi(kMachInt32, s0, p0, Not(CaptureEq(&merge))));
+    EXPECT_THAT(r.replacement(), IsPhi(MachineRepresentation::kWord32, s0, p0,
+                                       Not(CaptureEq(&merge))));
   }
 }