[llvm] [LoopUnroll] Prevent LoopFullUnrollPass from performing partial unrolling when trip counts are unknown (PR #165013)

[Michael Kruse via llvm-commits]

https://github.com/Meinersbur approved this pull request.

LGTM

That check should ideally be done together where partial/runtime unrolling is attempted (instead of mixing it with the profitabilit heuristic), but it is correct if the trip count is not known, full unrolling cannot take place.


https://github.com/llvm/llvm-project/pull/165013