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[LegacyPM] Use MapVector for OnTheFlyPassManagers.
Currently the iteration order of OnTheFlyManagers is not deterministic between executions, which means some of test/Other/opt-*-pipeline.ll tests fail non-deterministically if an additional on-the-fly manager is added, as in D45330. By using MapVector, we always iterate in the insertion order. As we are not removing elements, there shouldn't be a performance hit, except that we store an additional vector with the keys. Reviewers: efriedma, chandlerc, pcc, jhenderson Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D47317 llvm-svn: 333231
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