[turbofan] Make MachineType a pair of enums.

src/compiler/representation-change.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_REPRESENTATION_CHANGE_H_
 #define V8_COMPILER_REPRESENTATION_CHANGE_H_
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 
@@ skipping 68 matching lines @@
   RepresentationChanger(JSGraph* jsgraph, Isolate* isolate)
       : jsgraph_(jsgraph),
         isolate_(isolate),
         testing_type_errors_(false),
         type_error_(false) {}
 
   // Changes representation from {output_type} to {use_rep}. The {truncation}
   // parameter is only used for sanity checking - if the changer cannot figure
   // out signedness for the word32->float64 conversion, then we check that the
   // uses truncate to word32 (so they do not care about signedness).
-  Node* GetRepresentationFor(Node* node, MachineTypeUnion output_type,
-                             MachineTypeUnion use_rep,
+  Node* GetRepresentationFor(Node* node, MachineType output_type,
+                             MachineRepresentation use_rep,
                              Truncation truncation = Truncation::None());
   const Operator* Int32OperatorFor(IrOpcode::Value opcode);
   const Operator* Uint32OperatorFor(IrOpcode::Value opcode);
   const Operator* Float64OperatorFor(IrOpcode::Value opcode);
-  MachineType TypeFromUpperBound(Type* type);
+  MachineSemantic TypeFromUpperBound(Type* type);
 
   MachineType TypeForBasePointer(const FieldAccess& access) {
-    return access.tag() != 0 ? kMachAnyTagged : kMachPtr;
+    return access.tag() != 0 ? MachineType::AnyTagged()
+                             : MachineType::Pointer();
   }
 
   MachineType TypeForBasePointer(const ElementAccess& access) {
-    return access.tag() != 0 ? kMachAnyTagged : kMachPtr;
+    return access.tag() != 0 ? MachineType::AnyTagged()
+                             : MachineType::Pointer();
   }
 
  private:
   JSGraph* jsgraph_;
   Isolate* isolate_;
 
   friend class RepresentationChangerTester;  // accesses the below fields.
 
   bool testing_type_errors_;  // If {true}, don't abort on a type error.
   bool type_error_;           // Set when a type error is detected.
 
-  Node* GetTaggedRepresentationFor(Node* node, MachineTypeUnion output_type);
-  Node* GetFloat32RepresentationFor(Node* node, MachineTypeUnion output_type,
+  Node* GetTaggedRepresentationFor(Node* node, MachineType output_type);
+  Node* GetFloat32RepresentationFor(Node* node, MachineType output_type,
                                     Truncation truncation);
-  Node* GetFloat64RepresentationFor(Node* node, MachineTypeUnion output_type,
+  Node* GetFloat64RepresentationFor(Node* node, MachineType output_type,
                                     Truncation truncation);
-  Node* GetWord32RepresentationFor(Node* node, MachineTypeUnion output_type);
-  Node* GetBitRepresentationFor(Node* node, MachineTypeUnion output_type);
-  Node* GetWord64RepresentationFor(Node* node, MachineTypeUnion output_type);
-  Node* TypeError(Node* node, MachineTypeUnion output_type,
-                  MachineTypeUnion use);
+  Node* GetWord32RepresentationFor(Node* node, MachineType output_type);
+  Node* GetBitRepresentationFor(Node* node, MachineType output_type);
+  Node* GetWord64RepresentationFor(Node* node, MachineType output_type);
+  Node* TypeError(Node* node, MachineType output_type,
+                  MachineRepresentation use);
   Node* MakeTruncatedInt32Constant(double value);
   Node* InsertChangeFloat32ToFloat64(Node* node);
   Node* InsertChangeTaggedToFloat64(Node* node);
 
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const { return isolate_; }
   Factory* factory() const { return isolate()->factory(); }
   SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_