[llvm] [LV] Enable considering higher VFs when data extend ops are present i… (PR #137593)

[Sushant Gokhale via llvm-commits]

sushgokh wrote:

> I think @SamTebbs33 is working on improving register pressure calculations for partial reductions. It looks like in general with a better cost model we will maximise the vector bandwidth automatically because the phi nodes for the larger types disappear.

Thanks. But this issue has come up in one of the internal benchmark which does not  have partial reduction.

https://github.com/llvm/llvm-project/pull/137593