[llvm] [LV][SVE] Recognize potential DOT sequences and use a wider VF (PR #69587)

[Fangcao Wang via llvm-commits]

LittleMeepo wrote:

I also achieved a similar function by adding recipe to LoopVectorize: But I think the method of directly generating aarch64 intrinsic in LoopVectorize can only be used as a local temporary solution.

https://github.com/llvm/llvm-project/pull/69587