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

[via llvm-commits]

macurtis-amd wrote:

> The tests also don't make any sense to me, seeing as they compile down to a constant, unused insertelement.

@nikic I cleaned up the test function a bit, again starting from the original example. They exercise the new code paths, though they still result in an unused insertelement. Is that okay?



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