RFR(XS): 8014068: TEST_BUG: compiler/ciReplay/TestSA.sh fails on Windows: core wasn't generated

[Igor Ignatyev]

Hi all,

Please review patch.

Problem:
incorrect processing of core location on windows hosts due to using 
invalid variable.

Fix:
using of $OS was replaced by using of $VM_OS variable
fixed processing core locations for *nix: added core.<pid>
also slight cosmetic changes:
   - added check of OS before 'ulimit' change
   - not supported by all hosts '--brief' flags was removed

webrev: http://cr.openjdk.java.net/~iignatyev/8014068/webrev.00/
jbs: https://jbs.oracle.com/bugs/browse/JDK-8014068

-- 
Best regards,
Igor Ignatyev