[llvm] [bolt] Account for stubs with symbols in plt. (PR #192716)

[Alexey Moksyakov via llvm-commits]

yavtuk wrote:

> @maksfb let me know if this looks good to you. 
> @yavtuk Did you get a change to run your tests for mold?
> 
> When either of you approve, can you merge this on my behalf? I do not have permissions in LLVM to merge code.

I’m in the process of reviewing

https://github.com/llvm/llvm-project/pull/192716