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River Riddle authored
This revision adds a new support header, InterfaceSupport, to contain various generic bits of functionality for implementing "Interfaces". Interfaces embody a mechanism for attaching concept-based polymorphism to a type system. With this refactoring a new InterfaceMap type is added to allow for efficient interface lookups without going through an indirect call. This should provide a decent performance speedup without changing the size of AbstractOperation. In a future revision, this functionality will also be used to bring Interface like functionality to Attributes and Types. Differential Revision: https://reviews.llvm.org/D81882
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