[MLIR] Add Linalg support for integer (generalized) matmuls
This patch adds Linalg named ops for various types of integer matmuls.
Due to limitations in the tc spec/linalg-ods-gen ops cannot be type
polymorphic, so this instead creates new ops (improvements to the
methods for defining Linalg named ops are underway with a prototype at
To avoid the necessity of directly referencing these many new ops, this
adds additional methods to ContractionOpInterface to allow classifying
types of operations based on their indexing maps.
Reviewed By: nicolasvasilache, mravishankar
Differential Revision: https://reviews.llvm.org/D97006