[Bug 2922] [IcedTea8] Import latest AArch64 changes from aarch64-port/jdk8u

[bugzilla-daemon at icedtea.classpath.org]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2922

--- Comment #15 from hg commits <mercurial at icedtea.classpath.org> ---
details:
http://icedtea.classpath.org//hg/icedtea8-forest/hotspot?cmd=changeset;node=2bbfb04230ec
author: aph
date: Tue Sep 08 14:08:58 2015 +0100

    8135157, PR2922: DMB elimination in AArch64 C2 synchronization
implementation
    Summary: Reduce memory barrier usage in C2 fast lock and unlock.
    Reviewed-by: kvn
    Contributed-by: wei.tang at linaro.org, aph at redhat.com

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