Stella Laurenzo 85185b61b6 First pass on MLIR python context lifetime management. ...

* Per thread https://llvm.discourse.group/t/revisiting-ownership-and-lifetime-in-the-python-bindings/1769
* Reworks contexts so it is always possible to get back to a py::object that holds the reference count for an arbitrary MlirContext.
* Retrofits some of the base classes to automatically take a reference to the context, elimintating keep_alives.
* More needs to be done, as discussed, when moving on to the operations/blocks/regions.

Differential Revision: https://reviews.llvm.org/D87886

2020-09-18 12:17:50 -07:00

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