[llvm] [PowerPC] Alignment of toc-data symbol should not be increased during optimizations (PR #94593)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

New documentation looks fine.  One minor suggestion for the code; otherwise LGTM

https://github.com/llvm/llvm-project/pull/94593