[llvm] [llvm-ml] Fix RIP-relative addressing for ptr operands (PR #107618)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Unfortunately, I had to revert this, as this triggered failed asserts when building the openmp runtime assembly sources. See https://github.com/llvm/llvm-project/commit/1581183d59b87760521e7223df3ff25c57e72fb3 for details on how to build that, and for the single instruction that triggers the assert (`lea rdx, QWORD PTR [rax*8+16]`).

https://github.com/llvm/llvm-project/pull/107618