[8u] RFR 8218682: [TEST_BUG] DashOffset fails in mach5

[Zhengyu Gu]

I would like to backport this patch to 8u for parity with Oracle 8u281.

Other than the tests are not in 8u's ProblemList, the patch applies cleanly.

The original bug: https://bugs.openjdk.java.net/browse/JDK-8218682
                   https://bugs.openjdk.java.net/browse/JDK-8198411
The original patch:
                   http://hg.openjdk.java.net/jdk/jdk/rev/af2ed7605f8c

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8218682-8u/webrev.00/

Thanks,

-Zhengyu