[clang] [llvm] [SROA] Vector promote some memsets (PR #133301)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> We do support unaligned access IIUC, and it is actually required by HSA ABI. CC @arsenm

Unaligned access has been supported since almost always. There's just a mode control for it, you can disable it in the driver though 



https://github.com/llvm/llvm-project/pull/133301