[turbofan] Remove last_use_ field from Node.

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

 // Copyright 2015 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/compiler/common-operator.h"
 #include "src/compiler/node-properties.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using testing::AnyOf;
 using testing::ElementsAre;
 using testing::IsNull;
+using testing::UnorderedElementsAre;
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 typedef TestWithZone NodePropertiesTest;
 
 
 namespace {
 
@@ skipping 26 matching lines @@
   CommonOperatorBuilder common(zone());
   Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
   Node* node = Node::New(zone(), 0, &kMockOpEffect, 1, &start, false);
   Node* use_effect = Node::New(zone(), 0, common.EffectPhi(1), 1, &node, false);
   Node* replacement = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
   NodeProperties::ReplaceWithValue(node, replacement);
   EXPECT_EQ(start, use_effect->InputAt(0));
   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));
 }
 
 
 TEST_F(NodePropertiesTest, ReplaceWithValue_ControlUse) {
   CommonOperatorBuilder common(zone());
   Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
   Node* node = Node::New(zone(), 0, &kMockOpControl, 1, &start, false);
   Node* success = Node::New(zone(), 0, common.IfSuccess(), 1, &node, false);
   Node* use_control = Node::New(zone(), 0, common.Merge(1), 1, &success, false);
   Node* replacement = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
   NodeProperties::ReplaceWithValue(node, replacement);
   EXPECT_EQ(start, use_control->InputAt(0));
   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));
 }
 
 
 TEST_F(NodePropertiesTest, FindProjection) {
   CommonOperatorBuilder common(zone());
   Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
   Node* proj0 = Node::New(zone(), 1, common.Projection(0), 1, &start, false);
   Node* proj1 = Node::New(zone(), 2, common.Projection(1), 1, &start, false);
   EXPECT_EQ(proj0, NodeProperties::FindProjection(start, 0));
   EXPECT_EQ(proj1, NodeProperties::FindProjection(start, 1));
@@ skipping 35 matching lines @@
   Node* if_value2 = Node::New(zone(), 4, common.IfValue(2), 1, &sw, false);
   NodeProperties::CollectControlProjections(sw, result, arraysize(result));
   EXPECT_THAT(result[0], AnyOf(if_value1, if_value2));
   EXPECT_THAT(result[1], AnyOf(if_value1, if_value2));
   EXPECT_EQ(if_default, result[2]);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8