[turbofan] Make MachineType a pair of enums.

src/compiler/loop-peeling.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/loop-peeling.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-marker.h"
 #include "src/compiler/node-properties.h"
@@ skipping 293 matching lines @@
           } else {
             // don't do anything for control edges.
             // TODO(titzer): should update control edges to peeled?
           }
         }
       }
 
       // Update all the value and effect edges at once.
       if (!value_edges.empty()) {
         // TODO(titzer): machine type is wrong here.
-        Node* phi = graph->NewNode(common->Phi(kMachAnyTagged, 2), node,
-                                   peeling.map(node), merge);
+        Node* phi =
+            graph->NewNode(common->Phi(MachineRepresentation::kTagged, 2), node,
+                           peeling.map(node), merge);
         for (Edge edge : value_edges) edge.UpdateTo(phi);
         value_edges.clear();
       }
       if (!effect_edges.empty()) {
         Node* effect_phi = graph->NewNode(common->EffectPhi(2), node,
                                           peeling.map(node), merge);
         for (Edge edge : effect_edges) edge.UpdateTo(effect_phi);
         effect_edges.clear();
       }
     }
   }
 
   return iter;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8