[flang] [llvm] Reland [VPlan] Expand WidenInt inductions with nuw/nsw (PR #168354)

[Ramkumar Ramachandra via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
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artagnon wrote:

Yes, I think so. I tried forcing scalable in the general case, but it doesn't crash.

https://github.com/llvm/llvm-project/pull/168354