compiler/debug/TestStressIGVN.java fails after JDK-8252219:

java.lang.RuntimeException: got the same IGVN trace for different seeds: expected to not equal
at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.test.lib.Asserts.assertNotEquals(Asserts.java:394)
at jdk.test.lib.Asserts.assertNE(Asserts.java:367)
at compiler.debug.TestStressIGVN.main(TestStressIGVN.java:65)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)