[11u] RFR: 8185734: [Windows] Structured Exception Catcher missing around gtest execution

[Thomas Stüfe]

Hi,

May I please have a review for the downport of this patch. I would like to
dowport it since it allows us to run gtests which test signal handling on
Windows in 11u. This is a precondition for downporting "8257828 SafeFetch
may crash if invoked in non-JavaThreads", which is also in work.

JBS:            https://bugs.openjdk.java.net/browse/JDK-8185734

Original patch: https://github.com/openjdk/jdk/commit/568dc29b.diff
Original PR:    https://git.openjdk.java.net/jdk/pull/1757

The original patch does not apply cleanly due to changes done in
GTestWrapper.java in the wake of JEP 387. However, the delta is minimal
(just one line).

11u patch:
http://cr.openjdk.java.net/~stuefe/webrevs/backports/8185734-Windows-Structured-Exception-Catcher-missing-around-gtest-execution-11u.diff

Thank you!

Thomas