[turbofan] Make MachineType a pair of enums.

test/unittests/compiler/js-context-relaxation-unittest.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/js-context-relaxation.h"
 #include "src/compiler/js-graph.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class JSContextRelaxationTest : public GraphTest {
  public:
   JSContextRelaxationTest() : GraphTest(3), javascript_(zone()) {}
   ~JSContextRelaxationTest() override {}
 
  protected:
   Reduction Reduce(Node* node, MachineOperatorBuilder::Flags flags =
                                    MachineOperatorBuilder::kNoFlags) {
-    MachineOperatorBuilder machine(zone(), kMachPtr, flags);
+    MachineOperatorBuilder machine(zone(), MachineType::PointerRepresentation(),
+                                   flags);
     JSGraph jsgraph(isolate(), graph(), common(), javascript(), nullptr,
                     &machine);
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
     JSContextRelaxation reducer;
     return reducer.Reduce(node);
   }
 
   Node* EmptyFrameState() {
     MachineOperatorBuilder machine(zone());
@@ skipping 242 matching lines @@
       javascript()->CallFunction(2, STRICT, VectorSlotPair()), input0, input1,
       context, frame_state_2, frame_state_2, effect, control);
   Reduction const r = Reduce(node);
   EXPECT_FALSE(r.Changed());
   EXPECT_EQ(context, NodeProperties::GetContextInput(node));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8