[llvm] [llvm][CodeGen] respect booleanVectorContents while UnrollVSETCC (PR #97589)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

https://github.com/RKSimon/llvm-project/tree/unroll-setcc shows some definite improvements and a few target specific regressions to deal with. In particular arm/thumb2 appear to miss some easy folds to a CSINV/CSINC node from a ARMISD::CMOV node instead of a ISD::SELECT node.

https://github.com/llvm/llvm-project/pull/97589