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

[Fangrui Song via llvm-commits]

MaskRay wrote:

>  This is not expected, since toc-data symbol has the same alignment as toc entry and should not be increased during optimizations.

Why does AIX have this requirement? ppc64 ELFv2 ABI can increase the alignment without any issue.

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