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

test/unittests/compiler/x64/instruction-selector-x64-unittest.cc

Index: test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
diff --git a/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc b/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
index a6b3514bc10f1abeb103408b6da1b521854c038c..d6ed73266cabaf990b956f36a76433c51dc6207e 100644
--- a/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
+++ b/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
@@ -126,8 +126,8 @@ TEST_P(InstructionSelectorMemoryAccessTest, StoreWithParameters) {
   const MemoryAccess memacc = GetParam();
   StreamBuilder m(this, MachineType::Int32(), MachineType::Pointer(),
                   MachineType::Int32(), memacc.type);
-  m.Store(memacc.type, m.Parameter(0), m.Parameter(1), m.Parameter(2),
-          kNoWriteBarrier);
+  m.Store(memacc.type.representation(), m.Parameter(0), m.Parameter(1),
+          m.Parameter(2), kNoWriteBarrier);
   m.Return(m.Int32Constant(0));
   Stream s = m.Build();
   ASSERT_EQ(1U, s.size());