[turbofan] Lower "-0.0 - x" in the MachineOperatorReducer.

test/unittests/compiler/node-test-utils.h

Index: test/unittests/compiler/node-test-utils.h
diff --git a/test/unittests/compiler/node-test-utils.h b/test/unittests/compiler/node-test-utils.h
index 97355a5d945237de935ce329a36c7cb3d3025ffe..f1a1d328d15072a390112a24a8addd1cfcafd312 100644
--- a/test/unittests/compiler/node-test-utils.h
+++ b/test/unittests/compiler/node-test-utils.h
@@ -394,6 +394,7 @@ Matcher<Node*> IsChangeUint32ToUint64(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsTruncateFloat64ToFloat32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsTruncateInt64ToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat32Abs(const Matcher<Node*>& input_matcher);
+Matcher<Node*> IsFloat32Neg(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat32Equal(const Matcher<Node*>& lhs_matcher,
                               const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsFloat32LessThan(const Matcher<Node*>& lhs_matcher,
@@ -407,6 +408,7 @@ Matcher<Node*> IsFloat64Min(const Matcher<Node*>& lhs_matcher,
 Matcher<Node*> IsFloat64Sub(const Matcher<Node*>& lhs_matcher,
                             const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsFloat64Abs(const Matcher<Node*>& input_matcher);
+Matcher<Node*> IsFloat64Neg(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat64Sqrt(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat64RoundDown(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat64RoundTruncate(const Matcher<Node*>& input_matcher);