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

test/cctest/compiler/test-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/base/utils/random-number-generator.h"
 #include "src/codegen.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator-reducer.h"
 #include "src/compiler/operator-properties.h"
 #include "src/compiler/typer.h"
@@ skipping 695 matching lines @@
   Node* load = R.graph.NewNode(R.machine.Load(MachineType::Int32()), base,
                                index, R.graph.start(), R.graph.start());
 
   {
     MachineOperatorReducer reducer(&R.jsgraph);
     Reduction reduction = reducer.Reduce(load);
     CHECK(!reduction.Changed());  // loads should not be reduced.
   }
 
   {
-    Node* store = R.graph.NewNode(R.machine.Store(StoreRepresentation(
-                                      MachineType::Int32(), kNoWriteBarrier)),
-                                  base, index, load, load, R.graph.start());
+    Node* store =
+        R.graph.NewNode(R.machine.Store(StoreRepresentation(
+                            MachineRepresentation::kWord32, kNoWriteBarrier)),
+                        base, index, load, load, R.graph.start());
     MachineOperatorReducer reducer(&R.jsgraph);
     Reduction reduction = reducer.Reduce(store);
     CHECK(!reduction.Changed());  // stores should not be reduced.
   }
 }
 
 
 // TODO(titzer): test MachineOperatorReducer for Word64And
 // TODO(titzer): test MachineOperatorReducer for Word64Or
 // TODO(titzer): test MachineOperatorReducer for Word64Xor
@@ skipping 16 matching lines @@
 // TODO(titzer): test MachineOperatorReducer for Float64Compare
 // TODO(titzer): test MachineOperatorReducer for Float64Add
 // TODO(titzer): test MachineOperatorReducer for Float64Sub
 // TODO(titzer): test MachineOperatorReducer for Float64Mul
 // TODO(titzer): test MachineOperatorReducer for Float64Div
 // TODO(titzer): test MachineOperatorReducer for Float64Mod
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8