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

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yonghong-song wrote:

> > One request: please avoid force pushing changes when possible. It makes it impossible to use github's support for comparing to my last review or other old commits. See https://llvm.org/docs/GitHub.html#rebasing-pull-requests-and-force-pushes.
> 
> Gentle reminder to avoid force pushing while review in progress.

I indeed avoided force pushing except I force push clang-format related changes immediately after I had a new revision.

https://github.com/llvm/llvm-project/pull/178587