[turbofan] Make MachineType a pair of enums.

src/compiler/instruction-selector.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_SELECTOR_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_H_
 
 #include <map>
 
 #include "src/compiler/common-operator.h"
@@ skipping 135 matching lines @@
 
   // Inform the instruction selection that {node} was just defined.
   void MarkAsDefined(Node* node);
 
   // Inform the instruction selection that {node} has at least one use and we
   // will need to generate code for it.
   void MarkAsUsed(Node* node);
 
   // Inform the register allocation of the representation of the value produced
   // by {node}.
-  void MarkAsRepresentation(MachineType rep, Node* node);
-  void MarkAsWord32(Node* node) { MarkAsRepresentation(kRepWord32, node); }
-  void MarkAsWord64(Node* node) { MarkAsRepresentation(kRepWord64, node); }
-  void MarkAsFloat32(Node* node) { MarkAsRepresentation(kRepFloat32, node); }
-  void MarkAsFloat64(Node* node) { MarkAsRepresentation(kRepFloat64, node); }
-  void MarkAsReference(Node* node) { MarkAsRepresentation(kRepTagged, node); }
+  void MarkAsRepresentation(MachineRepresentation rep, Node* node);
+  void MarkAsWord32(Node* node) {
+    MarkAsRepresentation(MachineRepresentation::kWord32, node);
+  }
+  void MarkAsWord64(Node* node) {
+    MarkAsRepresentation(MachineRepresentation::kWord64, node);
+  }
+  void MarkAsFloat32(Node* node) {
+    MarkAsRepresentation(MachineRepresentation::kFloat32, node);
+  }
+  void MarkAsFloat64(Node* node) {
+    MarkAsRepresentation(MachineRepresentation::kFloat64, node);
+  }
+  void MarkAsReference(Node* node) {
+    MarkAsRepresentation(MachineRepresentation::kTagged, node);
+  }
 
   // Inform the register allocation of the representation of the unallocated
   // operand {op}.
-  void MarkAsRepresentation(MachineType rep, const InstructionOperand& op);
+  void MarkAsRepresentation(MachineRepresentation rep,
+                            const InstructionOperand& op);
 
   enum CallBufferFlag {
     kCallCodeImmediate = 1u << 0,
     kCallAddressImmediate = 1u << 1,
     kCallTail = 1u << 2
   };
   typedef base::Flags<CallBufferFlag> CallBufferFlags;
 
   // Initialize the call buffer with the InstructionOperands, nodes, etc,
   // corresponding
@@ skipping 66 matching lines @@
   BoolVector defined_;
   BoolVector used_;
   IntVector virtual_registers_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_H_