[PATCH][GAS] aarch64: Add WFET instruction for Armv8.7-a

[Przemyslaw Wirkus]

> > gas/ChangeLog:
> >
> > 2020-10-27  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* NEWS: Update docs.
> > 	* testsuite/gas/aarch64/system-5.d: New test.
> > 	* testsuite/gas/aarch64/system-5.s: New test.
> >
> > opcodes/ChangeLog:
> >
> > 2020-10-27  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* aarch64-tbl.h (struct aarch64_opcode): Add new WFET instruction
> encoding
> > 	and operand description.
> > 	* aarch64-asm-2.c: Regenerate.
> > 	* aarch64-dis-2.c: Regenerate.
> > 	* aarch64-opc-2.c: Regenerate.
> 
> Approved - please apply.

commit 82503ca7ed8301dc076919d5010bf981e35b1314

> Cheers
>   Nick
>