George df9ae59928 Use MlirStringRef throughout the C API
While this makes the unit tests a bit more verbose, this simplifies the creation of bindings because only the bidirectional mapping between the host language's string type and MlirStringRef need to be implemented.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D91905
2020-11-23 14:07:30 -08:00
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2020-11-23 14:07:30 -08:00