[8u] RFR for backport of JDK-8180855: Null pointer dereference in OopMapSet::all_do of oopMap.cpp:394

[Shafi Ahmad]

Hi,

Please review the backport of 'JDK- 8180855: Null pointer dereference in OopMapSet::all_do of oopMap.cpp:394' to jdk8u.
Please note that this is not a clean backport because the code change in jdk8u is under if-block 'if ( loc != NULL ) {'  whereas in jdk9 this if-block is not there.    

Webrev: http://cr.openjdk.java.net/~shshahma/8180855/webrev.00/
Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8180855
Original patch pushed to jdk9: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/1ae9e84f68b3

Test:  Run jprt.

Regards,
Shafi