[turbofan] Make MachineType a pair of enums.

test/unittests/compiler/move-optimizer-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/move-optimizer.h"
 #include "test/unittests/compiler/instruction-sequence-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 49 matching lines @@
   }
 
  private:
   InstructionOperand ConvertMoveArg(TestOperand op) {
     CHECK_EQ(kNoValue, op.vreg_.value_);
     CHECK_NE(kNoValue, op.value_);
     switch (op.type_) {
       case kConstant:
         return ConstantOperand(op.value_);
       case kFixedSlot:
-        return AllocatedOperand(LocationOperand::STACK_SLOT, kRepWord32,
-                                op.value_);
+        return AllocatedOperand(LocationOperand::STACK_SLOT,
+                                MachineRepresentation::kWord32, op.value_);
       case kFixedRegister:
         CHECK(0 <= op.value_ && op.value_ < num_general_registers());
-        return AllocatedOperand(LocationOperand::REGISTER, kRepWord32,
-                                op.value_);
+        return AllocatedOperand(LocationOperand::REGISTER,
+                                MachineRepresentation::kWord32, op.value_);
       case kExplicit:
         CHECK(0 <= op.value_ && op.value_ < num_general_registers());
-        return ExplicitOperand(LocationOperand::REGISTER, kRepWord32,
-                               op.value_);
+        return ExplicitOperand(LocationOperand::REGISTER,
+                               MachineRepresentation::kWord32, op.value_);
       default:
         break;
     }
     CHECK(false);
     return InstructionOperand();
   }
 };
 
 
 TEST_F(MoveOptimizerTest, RemovesRedundant) {
@@ skipping 152 matching lines @@
     }
   }
   CHECK_EQ(1, redundants);
   CHECK_EQ(1, assignment);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8