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* proc_rmdead: use explicit pattern set when there are no wildcardsZachary Snow2021-07-291-0/+4
If width of a case expression was large, explicit patterns could cause the existing logic to take an extremely long time, or exhaust the maximum size of the underlying set. For cases where all of the patterns are fully defined and there are no constants in the case expression, this change uses a simple set to track which patterns have been seen.