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78dcef41e1
To help with debugging non-trivial unswitching issues. Don't care about the legacy pass, nobody is using it. If a pass's string params are empty (e.g. "simple-loop-unswitch"), don't default to the empty constructor for the pass params. We should still let the parser take care of it in case the parser has its own defaults. Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D105933