[PowerPC] Add missed clang portion of c933c2eb3346

The clang portion of c933c2eb3346 was missed as I made
some kind of mistake squashing the commits with git.
This patch just adds those.

The original review: https://reviews.llvm.org/D114088

GitOrigin-RevId: dc1aa8eacd1e0e554f206cc15d730f37ea90c4ea
3 files changed