RFR 8072030 Race condition in ThenComposeExceptionTest.java

[Paul Sandoz]

Hi,

http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8072030-thenComposeException-test-race-condition/webrev/

I introduced a silly race condition in the test ThenComposeExceptionTest.java. This manifested itself in hotspot testing where various VM options increased the probability of failure.

Thanks,
Paul.