[PATCH] [AArch64] Add add/sub/cmp/cmn aliases to MC AsmParser

[Tim Northover]

> Yes, searching through the armcc docs is not ideal. And frankly, I
> agree people shouldn't have to.

If nothing else, I don't think armcc is a paragon of "this is how it
should be done". Any more than GCC or we are.

Cheers.

Tim.