[llvm] [AArch64][GlobalISel] Added support for hadd family of intrinsics (PR #163985)

[David Green via llvm-commits]

davemgreen wrote:

IIRC GISel is more consistent about putting the S/U at the start of the name.  I think there are some others like G_SMULH which are better off is GISel too. The only one that is backwards is G_ABDS/G_ABDU, which I would like to change to be prefixed by the sign too.

https://github.com/llvm/llvm-project/pull/163985