Performance regression in reindex.LevelAlign.time_reindex_level
https://pandas.pydata.org/speed/pandas/index.html#reindex.LevelAlign.time_reindex_level?commits=a0c8425a5f2b74e8a716defd799c4a3716f66eff-2a319238e47d3d7362188f7da4eb911199c423b8

Somewhere in https://github.com/pandas-dev/pandas/compare/a0c8425a5f2b74e8a716defd799c4a3716f66eff...2a319238e47d3d7362188f7da4eb911199c423b8