RFR(S) : 8166129 : hitting vmassert during gtest execution doesn't generate core and hs_err files

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8166129/webrev.00/
> 54 lines changed: 31 ins; 14 del; 9 mod;

Hi all,

could you please review the patch which enables core dumping and hs_err file generation in case of vmassert, guarantee and the like are hit during gtest tests execution?

before this fix, we always initialize a jvm w/ -XX:+SuppressFatalErrorMessage and -XX:-CreateCoredumpOnCrash, now we do so only if we run assert tests, tests which we expect to hit an vmassert. 

JBS: https://bugs.openjdk.java.net/browse/JDK-8166129
webrev: http://cr.openjdk.java.net/~iignatyev/8166129/webrev.00/

Thanks,
— Igor