Please have a quick look at 8274730: AArch64: AES/GCM acceleration is broken by the fix for JDK-8273297

[Andrew Haley]

I had to touch common code in C2 to unbreak AArch64, so I'd like
another reviewer, please. It's pretty simple, thanks.

https://github.com/openjdk/jdk/pull/5819

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