[clang] [lld] [llvm] Revert "[ThinLTO] Reduce the number of renaming due to promotions (#178587)" (PR #183782)

[Aiden Grossman via cfe-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM given this is a revert and would fix some build breakage (https://github.com/llvm/llvm-project/pull/183784).

https://github.com/llvm/llvm-project/pull/183782