Added AffineLoopInterchange pass to the Affine/Transforms folder. #236
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It implements a loop interchange pass in MLIR driven by an analytical cost model that optimizes for locality (spatial, temporal - both self and group) and parallelism for multicores (so as to minimize the frequence of synchronization). The pass is implemented on the Affine dialect in MLIR. The pass is able to handle both perfectly nested loop nests and imperfectly nested ones. It does not perform interchange in the presence of if conditionals and non-rectangular loop nests