RFR: 8185505: AArch64: Port AOT

[Andrew Haley]

http://cr.openjdk.java.net/~aph/8185505-1

The corresponding Graal changes are at

https://github.com/oracle/graal/pull/334/files

I think I've done all the things that reviewers mentioned.  There is a
clean set of test result for JVMCI and AOT.  Thank you everyone.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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