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

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index e5773c39aa8676e6ee08115a8ab5bc3b2380e026..a710d07260c5583d60e27e4d3ab8ebe62fcbcaa4 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -155,9 +155,9 @@ 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);
@@ -287,8 +287,7 @@ void InstructionSelector::VisitCheckedLoad(Node* node) {
 
 
 void InstructionSelector::VisitCheckedStore(Node* node) {
-  MachineRepresentation rep =
-      CheckedStoreRepresentationOf(node->op()).representation();
+  MachineRepresentation rep = CheckedStoreRepresentationOf(node->op());
   X64OperandGenerator g(this);
   Node* const buffer = node->InputAt(0);
   Node* const offset = node->InputAt(1);