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Dialect conversion infrastructure supports 1->N type conversions by requiring individual conversions to provide facilities to generate operations retrofitting N values into 1 of the original type when N > 1. This functionality can also be used to materialize explicit "cast"-like operations, but it did not support 1->1 type conversions until now. Modify TypeConverter to support materialization of cast operations for 1-1 conversions. This also makes materialization specification more extensible following the same pattern as type conversions. Instead of overloading a virtual function, users or subclasses of TypeConversion can now register type-specific materialization callbacks that will be called in order for the given type. Differential Revision: https://reviews.llvm.org/D79729
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