5c97397c2c
If we do load-only promotion, it is okay if we leave some loads alone. We only need to know all stores that affect a specific location. As such, we can handle loads with unknown offset via the "escaped read-only" code path. This is something we already support in LICM load-only promotion, but doing this in SROA is much better from a phase ordering perspective. Fixes https://github.com/llvm/llvm-project/issues/134513.