[llvm] [LV][VPlan] Add initial support for CSA vectorization (PR #106560)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> > is it possible to not nest the test under RISCV? I realized that you've said it's disabled in BasicTTIImpl, but having a separate cas.ll under each target wouldn't be ideal, no?
> 
> I can do this. It's a good idea.

Perhaps a good idea to name the test conditional-scalar-assignment.ll instead of the more cryptic csa.ll.

https://github.com/llvm/llvm-project/pull/106560