[turbofan] GraphReducer is more "fixpointish" now.

src/compiler/graph-reducer-unittest.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/compiler/graph.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/operator.h"
 #include "src/test/test-utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ skipping 79 matching lines @@
 TEST_F(GraphReducerTest, ReduceOnceForEveryReducer) {
   StrictMock<MockReducer> r1, r2;
   Node* node0 = graph()->NewNode(&OP0);
   EXPECT_CALL(r1, Reduce(node0));
   EXPECT_CALL(r2, Reduce(node0));
   ReduceNode(node0, &r1, &r2);
 }
 
 
 TEST_F(GraphReducerTest, ReduceAgainAfterChanged) {
-  Sequence s1, s2;
+  Sequence s1, s2, s3;
   StrictMock<MockReducer> r1, r2, r3;
   Node* node0 = graph()->NewNode(&OP0);
   EXPECT_CALL(r1, Reduce(node0));
   EXPECT_CALL(r2, Reduce(node0));
-  EXPECT_CALL(r3, Reduce(node0)).InSequence(s1, s2).WillOnce(
+  EXPECT_CALL(r3, Reduce(node0)).InSequence(s1, s2, s3).WillOnce(
       Return(Reducer::Changed(node0)));
   EXPECT_CALL(r1, Reduce(node0)).InSequence(s1);
   EXPECT_CALL(r2, Reduce(node0)).InSequence(s2);
+  EXPECT_CALL(r3, Reduce(node0)).InSequence(s3);
   ReduceNode(node0, &r1, &r2, &r3);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8