URGENT: RFR: 8199886: gc/cslocker/TestCSLocker.java crashes

[Kim Barrett]

> On Mar 20, 2018, at 4:59 PM, Per Liden <per.liden at oracle.com> wrote:
> 
> JDK-8199620 "Support for JNI object pinning" introduced a bug where a naked oop was passed across a safepoint (a call to GCLocker::lock_critical). This caused GCLocker-related tests in both hs-tier1-2 to fail. This patch stores the oop in a Handle before crossing the safepoint.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8199886
> Webrev: http://cr.openjdk.java.net/~pliden/8199886/webrev.0
> 
> Testing: Ran affected jtreg tests locally. hs-tier1-2 currently running in mach5
> 
> /Per

Looks good.