[turbofan] Correctify TruncateFloat64ToInt32 reduction in MachineOperatorReducer.

test/unittests/compiler/machine-operator-reducer-unittest.cc

Index: test/unittests/compiler/machine-operator-reducer-unittest.cc
diff --git a/test/unittests/compiler/machine-operator-reducer-unittest.cc b/test/unittests/compiler/machine-operator-reducer-unittest.cc
index 3e47ce8d95d8bda7333a295a895e8a00f8769fe2..558ad0070db5dcd8636e9938022d5787697ee6e4 100644
--- a/test/unittests/compiler/machine-operator-reducer-unittest.cc
+++ b/test/unittests/compiler/machine-operator-reducer-unittest.cc
@@ -469,6 +469,25 @@ TEST_F(MachineOperatorReducerTest, TruncateFloat64ToInt32WithPhi) {
 }
 
 
+TEST_F(MachineOperatorReducerTest,
+       TruncateFloat64ToInt32WithPhiAndChangeInt32ToFloat64) {
+  Node* const p0 = Parameter(0);
+  Node* const merge = graph()->start();
+  Node* const truncate = graph()->NewNode(
+      machine()->TruncateFloat64ToInt32(),
+      graph()->NewNode(common()->Phi(kMachFloat64, 2), p0, p0, merge));
+  truncate->InputAt(0)->ReplaceInput(
+      1, graph()->NewNode(machine()->ChangeInt32ToFloat64(), truncate));
+  Reduction reduction = Reduce(truncate);
+  ASSERT_TRUE(reduction.Changed());
+  Capture<Node*> phi;
+  EXPECT_THAT(
+      reduction.replacement(),
+      AllOf(CaptureEq(&phi), IsPhi(kMachInt32, IsTruncateFloat64ToInt32(p0),
+                                   CaptureEq(&phi), merge)));
+}
+
+
 // -----------------------------------------------------------------------------
 // TruncateInt64ToInt32