[8u] RFR for JDK-8168914: Crash in ClassLoaderData/JNIHandleBlock::oops_do during concurrent marking? to jdk8u-dev

[Shafi Ahmad]

Hi,
 
Please review the backport of bug: "JDK-8168914: Crash in ClassLoaderData/JNIHandleBlock::oops_do during concurrent marking" to jdk8u-dev

Please note that this is not a clean backport due to - 
A) Method  remove_handle(jobject h) is not present in jdk8u and looks it is related to module so I haven't merged associated change to jdk8u.
B) File moduleEntry.cpp is not present in jdk8u repo, so I have ignore its changes.


Webrev: http://cr.openjdk.java.net/~shshahma/8168914/webrev.00/
jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8168914
Original patch pushed to jdk9: http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/606c35b6fac5

Test:  Run jprt and jtreg is in progress.

Regards,
Shafi