[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 commented:

>From the perspective of the IR, this is the correct way to implement this restriction.  (toc-data should be documented in LangRef, though.)  I won't try to dive into the XCOFF side of this.

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