[turbofan] Make MachineType a pair of enums.

src/compiler/register-allocator-verifier.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/bit-vector.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/register-allocator-verifier.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 699 matching lines @@
       if (instr->IsCall()) {
         current->DropRegisters(config());
       }
       for (size_t i = 0; i < instr->OutputCount(); ++i, ++count) {
         int virtual_register = op_constraints[count].virtual_register_;
         OperandMap::MapValue* value =
             current->Define(zone(), instr->OutputAt(i), virtual_register);
         if (op_constraints[count].type_ == kRegisterAndSlot) {
           const AllocatedOperand* reg_op =
               AllocatedOperand::cast(instr->OutputAt(i));
-          MachineType mt = reg_op->machine_type();
+          MachineRepresentation rep = reg_op->representation();
           const AllocatedOperand* stack_op = AllocatedOperand::New(
-              zone(), LocationOperand::LocationKind::STACK_SLOT, mt,
+              zone(), LocationOperand::LocationKind::STACK_SLOT, rep,
               op_constraints[i].spilled_slot_);
           auto insert_result =
               current->map().insert(std::make_pair(stack_op, value));
           DCHECK(insert_result.second);
           USE(insert_result);
         }
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8