[turbofan] Store nodes use only MachineRepresentation, not MachineType.

src/compiler/machine-operator-reducer.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/machine-operator-reducer.h"
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/codegen.h"
 #include "src/compiler/diamond.h"
@@ skipping 660 matching lines @@
           common()->Phi(MachineRepresentation::kWord32, value_input_count));
       return Replace(phi);
     }
   }
   return NoChange();
 }
 
 
 Reduction MachineOperatorReducer::ReduceStore(Node* node) {
   MachineRepresentation const rep =
-      StoreRepresentationOf(node->op()).machine_type().representation();
+      StoreRepresentationOf(node->op()).representation();
   Node* const value = node->InputAt(2);
   switch (value->opcode()) {
     case IrOpcode::kWord32And: {
       Uint32BinopMatcher m(value);
       if (m.right().HasValue() && ((rep == MachineRepresentation::kWord8 &&
                                     (m.right().Value() & 0xff) == 0xff) ||
                                    (rep == MachineRepresentation::kWord16 &&
                                     (m.right().Value() & 0xffff) == 0xffff))) {
         node->ReplaceInput(2, m.left().node());
         return Changed(node);
@@ skipping 390 matching lines @@
 MachineOperatorBuilder* MachineOperatorReducer::machine() const {
   return jsgraph()->machine();
 }
 
 
 Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8