[clang] [llvm] [PowerPC][AIX] 64-bit large code-model support for toc-data (PR #90619)

[Chen Zheng via cfe-commits]

https://github.com/chenzheng1030 approved this pull request.

LGTM just some nits. I don't think it needs another review for them from my side.

Please commit when @diggerlin is also happy.

Thanks very much for adding this support.

https://github.com/llvm/llvm-project/pull/90619