AOT for AArch64: current status

[Andrew Haley]

I fixed a bug in Graal which was causing
compiler.aot.DeoptimizationTest to fail.

I fixed the bug which was causing assertion failures due to branch out
of range.

I pulled from the tip of Graal master.  It should all be up to date
now.

All pushed to https://github.com/theRealAph/graal.git aarch64-branch-overflows

I'm still seeing some assertion failures, but they're not in my code
and I don't think they're anything to do with me.  They all seem to do
with types not being registered.  Updating Graal didn't help, so I
need to try to figure out why this isn't a problem on x86.

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