[llvm] [ThinLTO] Reduce the number of renaming due to promotions in distribu… (PR #188074)

[via llvm-commits]

yonghong-song wrote:

> Thanks for the PR. Sorry, I've been swamped with other things but I plan to take a look next week.

Thanks @teresajohnson! I just rebased on top of the main branch, so we can keep the pull request up to date. 

https://github.com/llvm/llvm-project/pull/188074