[8u] RFR: 8241296: Segfault in JNIHandleBlock::oops_do()

[Andrew Haley]

Patch almost applies, very minor differences.

https://bugs.openjdk.java.net/browse/JDK-8241296

Original patch: http://cr.openjdk.java.net/~aph/8241296/
8u patch: http://cr.openjdk.java.net/~aph/8241296-8u/

OK for jdk8u/jdk8u-dev?

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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