RFR 8139875: [TESTBUG] Improve nsk/stress/stack/* tests

[Lois Foltan]

Looks good.
Lois

On 8/3/2020 2:11 PM, Harold Seigel wrote:
> Hi,
>
> Please review these small changes to reduce the amount of time 
> required by some of the nsk/stress/stack tests in order to prevent 
> them from timing out.  The changes include using -Xss to run the tests 
> with smaller stacks, prevent running with -Xcomp, and, for test 
> stack019, reduce the number of test iterations.
>
> Test stack019 was excluded from windows targets because, even with the 
> reduced iterations, the test was running for > 48 minutes.
>
> Open Webrev: 
> http://cr.openjdk.java.net/~hseigel/bug_8139875/webrev/index.html
>
> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8139875
>
> The tests were tested by running them in Mach5 tier5 and tier7 and 
> looking at their execution time.
>
> Thanks, Harold
>