[llvm] [LV][EVL] Skip tryAddExplicitVectorLength for plans with scalar VF. (PR #125497)

[Mel Chen via llvm-commits]

Mel-Chen wrote:

> Better to modify setTailFoldingStyles() and add a check to bool EVLIsLegal:
> 
> ```
> bool EVLIsLegal = IsScalableVF && UserIC <= 1 && ...
> ```
> 
> which was removed accidentally

It looks like another issue. I fixed it at https://github.com/llvm/llvm-project/pull/125678.


https://github.com/llvm/llvm-project/pull/125497