Missing aarch64 changes in hs due to mismerge from hs-comp to hs

[S. Bharadwaj Yadavalli]

As part of the hs-comp to hs push I did yesterday, it appears that I 
have mismerged the following  conflicting pushes to
src/cpu/aarch64/vm/macroAssembler_aarch64.hpp done on hs tree and 
hs-comp tree.

Fix for 8153310 
(http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/a07a10329f31) pushed to hs
Fix for 8153713 
(http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/f9545cf437eb) 
pushed to hs-comp
Fix for 8153797 
(http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/d4636cc092db) 
pushed to hs-comp

I picked the version in hs repo and overrode the changes from hs-comp.

I think the next push up to hs should consider merging both the changes 
in hs as well as in hs-comp.

Thanks,

Bharadwaj