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

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 43acaa027d8aefb772d280600fe3a5d6a7a7cc2d..a0d29beec6b97c731f159993dc2e85ab838a5815 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -348,9 +348,9 @@ void InstructionSelector::VisitStore(Node* node) {
   Node* index = node->InputAt(1);
   Node* value = node->InputAt(2);
 
-  StoreRepresentation store_rep = OpParameter<StoreRepresentation>(node);
+  StoreRepresentation store_rep = StoreRepresentationOf(node->op());
   WriteBarrierKind write_barrier_kind = store_rep.write_barrier_kind();
-  MachineRepresentation rep = store_rep.machine_type().representation();
+  MachineRepresentation rep = store_rep.representation();
 
   if (write_barrier_kind != kNoWriteBarrier) {
     DCHECK_EQ(MachineRepresentation::kTagged, rep);
@@ -455,8 +455,7 @@ void InstructionSelector::VisitCheckedLoad(Node* node) {
 
 
 void InstructionSelector::VisitCheckedStore(Node* node) {
-  MachineRepresentation rep =
-      CheckedStoreRepresentationOf(node->op()).representation();
+  MachineRepresentation rep = CheckedStoreRepresentationOf(node->op());
   ArmOperandGenerator g(this);
   Node* const buffer = node->InputAt(0);
   Node* const offset = node->InputAt(1);