REGRESSION(r169092 and r169102): Skip failing JSC tests poperly on non-x86 Darwin platforms
https://bugs.webkit.org/show_bug.cgi?id=133149

Patch by Eva Balazsfalvi <evab.u-szeged@partner.samsung.com> on 2014-06-03
Reviewed by Csaba Osztrogonác.

PerformanceTests/SunSpider:
* profiler-test.yaml: Skip profiler tests only if the architecture isn't x86 and the host is Darwin.

Source/JavaScriptCore:
* tests/mozilla/mozilla-tests.yaml: Skip js1_5/Regress/regress-159334.js only if the architecture isn't x86 and the host is Darwin.

Tools:
* Scripts/run-jsc-stress-tests: Added determineOS to determine the host operating system the script run on.

LayoutTests:
* js/script-tests/function-apply-many-args.js: Skip it only if the architecture isn't x86 and the host is Darwin.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169559 268f45cc-cd09-0410-ab3c-d52691b4dbfc