[llvm] [SelectionDAG] Move VSelect sign pattern check from AArch64 to general SelectionDAG (PR #151840)

[Craig Topper via llvm-commits]

topperc wrote:

> For some reason the check is already there, but it bails out. Probably to allow aarch64 to transform it, but why not have the logic in SelectionDAG then?

Have you consulted git blame and git log to see if you can find an answer?

https://github.com/llvm/llvm-project/pull/151840