[gcc(refs/users/meissner/heads/work190)] Add rs6000 architecture masks.

https://gcc.gnu.org/g:40d1544250a23d21dfd084e8fec939ee49d353cb commit 40d1544250a23d21dfd084e8fec939ee49d353cb Author: Michael Meissner Date: Thu Jan 2 17:12:41 2025 -0500 Add rs6000 architecture masks. This patch begins the journey to move architecture bits that are not user ISA

[gcc(refs/users/meissner/heads/work190)] Add rs6000 architecture masks.

https://gcc.gnu.org/g:fbcfcd3d2206fa3ea05a19de63135a75c0105595 commit fbcfcd3d2206fa3ea05a19de63135a75c0105595 Author: Michael Meissner Date: Thu Jan 2 17:12:41 2025 -0500 Add rs6000 architecture masks. This patch begins the journey to move architecture bits that are not user ISA