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

[Yingchi Long via llvm-commits]

inclyc wrote:

> Next step is to regenerate the changed test files and yak shave any regressions

I wonder why our previous approach did not trigger any regressions but this `getBoolExtOrTrunc` did?

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