[lit] Improve handling of parallelism group semaphores
[lit] Allow setting parallelism groups to NoneCheck that we do not crash if a parallelism group is explicitly set toNone. Permits usage of the following pattern.[lit.common.cfg] lit_config.par
[lit] Allow setting parallelism groups to NoneCheck that we do not crash if a parallelism group is explicitly set toNone. Permits usage of the following pattern.[lit.common.cfg] lit_config.parallelism_groups['my_group'] = None if <condition>: lit_config.parallelism_groups['my_group'] = 3[project/lit.cfg] config.parallelism_group = 'my_group'Reviewers: rnkDifferential Revision: https://reviews.llvm.org/D58305llvm-svn: 354912
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