[llvm] [LV] Fix MinBWs in WidenIntrinsic case (PR #137005)

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
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fhahn wrote:

might be worth changing the test name to something slightly more descriptive, e.g. `pr87407-trunc-with-intrinsic.ll` or something like that

https://github.com/llvm/llvm-project/pull/137005