[cherrypick][SCEV] Pick fixes for recursive loop guard collection. #9797
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…20442) When assumptions are present `Terms.size()` does not actually count the number of conditions collected from dominating branches; introduce a separate counter. Fixes llvm#120237 (cherry picked from commit acfd26a)
… collecting loop guards. (llvm#120749) When `collectFromBlock` is called without a predecessor (in particular for loops that don't have a unique predecessor outside the loop) we never start climbing the predecessor chain, and thus don't mark the starting block as visited. Fixes llvm#120615. (cherry picked from commit f035351)
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@swift-ci please test |
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Cherry pick SCEV fixes from llvm#120442 and llvm#120749.