[llvm] [PowerPC] Support PIC Secure PLT for CALL_RM (PR #121281)

[Brad Smith via llvm-commits]

brad0 wrote:

> > #72758
> > There was also a PR for the same fix. But for some reason George stopped responding.
> 
> Thanks for bringing up the old thread. I did not know similar code change was brought up before. I do prefer the tests in this patch, tho...

I just mean I think you can add a closes tag or whatever as this supersedes that PR.

https://github.com/llvm/llvm-project/pull/121281