Revert of [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 558ad0070db5dcd8636e9938022d5787697ee6e4..3e47ce8d95d8bda7333a295a895e8a00f8769fe2 100644
--- a/test/unittests/compiler/machine-operator-reducer-unittest.cc
+++ b/test/unittests/compiler/machine-operator-reducer-unittest.cc
@@ -469,25 +469,6 @@
 }
 
 
-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