[8u40] backport RFR: 8046210: Missing memory barrier when reading init_lock

[David Holmes]

8u40 backport request. Changes were pushed into JDK9 on the 2nd, no 
problems experienced. Changeset imports directly to jdk8u/hs-dev/hotspot.

Bug report is confidential. JDK 9 review thread:

http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2014-September/012431.html

JDK9 changeset:

http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/6818c5298fab

8u webrev:

http://cr.openjdk.java.net/~dholmes/8046210/webrev.8u/

Thanks,
David