[MLIR] Enable compilation of MLIR examples (toy, linalg, ...) (#3384)
[MLIR] Enable compilation of MLIR examples (toy, linalg, ...) (#3384)

This will avoid that we break MLIR examples when we are modifying MLIR
codebase directly.
NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph