Paul Walker d3441f7348
[LV] Change getSmallBestKnownTC to return an ElementCount (NFC) (#141793)
This is prep work for enabling better UF calculations when using vscale
based VFs to vectorise loops with vscale based tripcounts.

NOTE: NFC because All uses remain fixed-length until a following PR
changes LoopVectorize's version of getSmallConstantTripCount().
2025-06-18 11:45:20 +01:00
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