PATCH][GAS] aarch64: Add testcase for HCR_EL2 system register

[Przemyslaw Wirkus]

[snip]

> > OK for master ?
> 
> Approved - please apply.

commit ffd73a8b9ed30934b3cd00c15f5aa041621dcf9c

> > gas/ChangeLog:
> > 2020-10-16  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* testsuite/gas/aarch64/sysreg-6.d: New test.
> > 	* testsuite/gas/aarch64/sysreg-6.s: New test.
> 
> Cheers
>   Nick
>