[llvm] Revert "[LowerMemIntrinsics] Use correct alignment in residual loop for variable llvm.memcpy" (PR #98295)

[Fabian Ritter via llvm-commits]

ritter-x2a wrote:

I've observed the failure a couple of times on my system (so far only with the patch and not without it), but it is not consistent.
The output reports a "Memory access fault by GPU node[...]. Reason: Page not present or supervisor privilege. (exit 134)" when this happens.

https://github.com/llvm/llvm-project/pull/98295