Backport LLVM patches to fix various issues. (#50639)
-
https://github.com/llvm/llvm-project/commit/af39acda8873cc75db116e326588447f018a99d9
closing https://github.com/JuliaLang/julia/issues/50448
- https://reviews.llvm.org/D139078 closing
https://github.com/JuliaLang/julia/issues/49907
