[turbofan] Remove last_use_ field from Node.

test/unittests/compiler/node-properties-unittest.cc

Index: test/unittests/compiler/node-properties-unittest.cc
diff --git a/test/unittests/compiler/node-properties-unittest.cc b/test/unittests/compiler/node-properties-unittest.cc
index edaf430f8e690b2a39a2b6dc42afe2e592258e8b..2bec4faf4da6c67870a3ce99ffa12ad6222cc0aa 100644
--- a/test/unittests/compiler/node-properties-unittest.cc
+++ b/test/unittests/compiler/node-properties-unittest.cc
@@ -10,6 +10,7 @@
 using testing::AnyOf;
 using testing::ElementsAre;
 using testing::IsNull;
+using testing::UnorderedElementsAre;
 
 namespace v8 {
 namespace internal {
@@ -56,7 +57,7 @@ TEST_F(NodePropertiesTest, ReplaceWithValue_EffectUse) {
   EXPECT_EQ(0, node->UseCount());
   EXPECT_EQ(2, start->UseCount());
   EXPECT_EQ(0, replacement->UseCount());
-  EXPECT_THAT(start->uses(), ElementsAre(node, use_effect));
+  EXPECT_THAT(start->uses(), UnorderedElementsAre(use_effect, node));
 }
 
 
@@ -72,7 +73,7 @@ TEST_F(NodePropertiesTest, ReplaceWithValue_ControlUse) {
   EXPECT_EQ(0, node->UseCount());
   EXPECT_EQ(2, start->UseCount());
   EXPECT_EQ(0, replacement->UseCount());
-  EXPECT_THAT(start->uses(), ElementsAre(node, use_control));
+  EXPECT_THAT(start->uses(), UnorderedElementsAre(use_control, node));
 }