[turbofan] Make MachineType a pair of enums.

test/unittests/compiler/liveness-analyzer-unittest.cc

 // Copyright 2014 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-graph.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/liveness-analyzer.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/state-values-utils.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
 
 using testing::MakeMatcher;
 using testing::MatcherInterface;
 using testing::MatchResultListener;
 using testing::StringMatchResultListener;
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class LivenessAnalysisTest : public GraphTest {
  public:
   explicit LivenessAnalysisTest(int locals_count = 4)
       : locals_count_(locals_count),
-        machine_(zone(), kRepWord32),
+        machine_(zone(), MachineRepresentation::kWord32),
         javascript_(zone()),
         jsgraph_(isolate(), graph(), common(), &javascript_, nullptr,
                  &machine_),
         analyzer_(locals_count, zone()),
         empty_values_(graph()->NewNode(common()->StateValues(0), 0, nullptr)),
         next_checkpoint_id_(0),
         current_block_(nullptr) {}
 
 
  protected:
@@ skipping 333 matching lines @@
   EXPECT_THAT(c1_in_loop, IsCheckpointModuloLiveness(".L.L"));
   EXPECT_THAT(c2_in_loop, IsCheckpointModuloLiveness("LL.L"));
 
   EXPECT_THAT(c1_end, IsCheckpointModuloLiveness(".LL."));
   EXPECT_THAT(c2_end, IsCheckpointModuloLiveness("...."));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8