RFR: Several small aarch64 fixes

[Aleksey Shipilev]

On 05/04/2018 03:43 PM, Roman Kennke wrote:
> It's clearly Friday and aarch64 assembler ate my brains.
> 
> Diff:
> http://cr.openjdk.java.net/~rkennke/aarch64-fixes/webrev.02.diff/
> Full:
> http://cr.openjdk.java.net/~rkennke/aarch64-fixes/webrev.02/
> 
> Good?

Yup, good!

-Aleksey