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bae595b742
SCCs. These will be fairly expensive routines to call and might be abused in real code, but are quite useful when debugging or in asserts and are reasonable and well formed properties to query. I've used one of them in an assert that was requested in a code review here. In subsequent commits I'll start using these routines more heavily, for example in unittests etc. But this at least gets the groundwork in place. Differential Revision: https://reviews.llvm.org/D25506 llvm-svn: 287682