[llvm] [LV] Support float and pointer conditional scalar assignments (PR #184101)

[Florian Hahn via llvm-commits]

https://github.com/fhahn approved this pull request.

LGTM, assuming the cost model changes were not needed to prevent a crash with SVE.

For the title, seems clearer to mention FindLast reductions, which is the terminology used in IVDescriptor/LV.

https://github.com/llvm/llvm-project/pull/184101