[8u] RFA: 8158639: C2 compilation fails with SIGSEGV

[David Buck]

Hi!

Please approve this simple backport from 9 to 8u-dev.

bug report:
[ 8158639: C2 compilation fails with SIGSEGV ]
https://bugs.openjdk.java.net/browse/JDK-8158639

JDK 9 changeset:
http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/119a2a3cc29b

8u-dev Webrev:
http://cr.openjdk.java.net/~dbuck/jdk8158639_8u_01/

backport code review:
http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-November/025225.html

Testing:
Manual verification and JPRT (default and hotspot testsets)

Cheers,
-Buck