[llvm] Reland [llvm-ml] Fix RIP-relative addressing for ptr operands (PR #108061)

[Eric Astor via llvm-commits]

https://github.com/ericastor commented:

Seems sensible to me - but @mstorsjo should probably check that this works on the OpenMP build too. (I'm less experienced with that.)

https://github.com/llvm/llvm-project/pull/108061