8145553: Fix warnings in AArch64 directory

[Lindenmaier, Goetz]

Hi Andrew, 

Looks good.
Thanks for adding all these in the end.

Best regards,
  Goetz.


> -----Original Message-----
> From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On
> Behalf Of Andrew Haley
> Sent: Wednesday, December 16, 2015 2:30 PM
> To: hotspot-dev Source Developers <hotspot-dev at openjdk.java.net>
> Subject: RFR: 8145553: Fix warnings in AArch64 directory
> 
> http://cr.openjdk.java.net/~aph/8145553/
> 
> These are mostly because ShouldNotReachHere() is not marked as
> noreturn.  I understand that this has been discussed in the past and
> it was decided not to fix it because it broke stack traces.
> 
> I've marked all of the bogus assignments as unreachable so that they
> can be removed if ever ShouldNotReachHere() is fixed.
> 
> Andrew.