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

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Hi @RKSimon,
> 
> > 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? I guess because `select` was changed to `setcc`?

I'd guess we are missing some bool extend combines compared to the select 

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