[clang] [llvm] [LLVM][SVE] Add dedicated intrinsics to cast between svcount_t and svbool_t. (PR #218667)

[Sander de Smalen via llvm-commits]

https://github.com/sdesmalen-arm approved this pull request.

I guess this narrows the scope of the intrinsics to what their original scope was before svcount, which I guess is better for combines so that it doesn't need to check types before doing a transform (which may already have impacted some existing combines?)

https://github.com/llvm/llvm-project/pull/218667