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Add a basic C API for the MLIR PassManager as well as a basic TableGen backend…

Authored by mehdi_amini on Nov 3 2020, 1:38 PM.

Description

Add a basic C API for the MLIR PassManager as well as a basic TableGen backend for creating passes

This is exposing the basic functionalities (create, nest, addPass, run) of
the PassManager through the C API in the new header: include/mlir-c/Pass.h.

In order to exercise it in the unit-test, a basic TableGen backend is
also provided to generate a simple C wrapper around the pass
constructor. It is used to expose the libTransforms passes to the C API.

Reviewed By: stellaraccident, ftynse

Differential Revision: https://reviews.llvm.org/D90667