[llvm] [VPlan] Convert EVL loops to variable-length stepping after dissolution (PR #147222)

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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fhahn wrote:

For consistency with other related tests, would be good to call it `vector-loop-backedge-elimination-with-evl.ll` or something like tat

https://github.com/llvm/llvm-project/pull/147222