[SelDag] Use use BoolVT size when expanding find-last-active, if larger. (#175971) On some targets, BoolVT may have been widened earlier. In those cases, choosing StepVT to be smaller can cause crashes when widening the mis-matched select. Without the fix, the new test @extract_last_active_v4i32_penryn crashes when trying to widen. It also improves codegen for other cases. PR: https://github.com/llvm/llvm-project/pull/175971
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