[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:

Another indication of this is that only RVV stage 2 buildbots crashed with the previous patch.

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