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There are cases (like in an upcoming patch to MLIR's `Property` class) where the ? value is a useful null value. However, existing predicates make ti difficult to test if the value in a record one is operating is ? or not. This commit adds the !initialized predicate, which is 1 on concrete, non-? values and 0 on ?. --------- Co-authored-by: Akshat Oke <Akshat.Oke@amd.com>