[clang] [llvm] [SROA] Canonicalize homogeneous structs into fixed vectors (PR #165159)

[Yaxun Liu via llvm-commits]

yxsamliu wrote:

> > @YonahGoldberg gentle ping — the regression is fixed and the new benchmark run looks clean. Any further concerns, or is this good to go?
> 
> Do we not care about the regression in neatosplines.ll? Looks like there's some extra unnecessary vectorization that happens.

Got latest up-to-date result: https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/64

https://github.com/llvm/llvm-project/pull/165159