[llvm] [InstCombine] Prevent crash when folding struct-returning ops into vector selects (PR #173208)

[via llvm-commits]

Michael-Chen-NJU wrote:

Thank you for the review. Since #173062 has already been merged to address the immediate crash with intrinsics, the primary issue is now mitigated.

Closing this PR.

https://github.com/llvm/llvm-project/pull/173208