Add support for specializing linalg.broadcast and linalg.transform from generic. Also, does some refactoring to reuse specialization checks, migrating some common uses to op interface methods.
Add a new mlir-opt pass `--linalg-specialize-generic-ops` which lifts generic,
where possible, to linalg named ops.
Much like `-linalg-generalize-named-ops` lowers named ops to linalg.generic .
Also add patterns to recognize contractions which can be specialized from
linalg.generic to named op: `linalg.{batch_}?matmul{_transpose_(a|b)}?`
Currently only linalg.copy is recognized when trying to specialize
linalg.generics back to named op. This diff enables recognition of more
generic to named op e.g. linalg.fill, elemwise unary/binary.
Introduce an operation to specialize linalg.generics, for example,
detecting a linalg.generic that is semantically equivalent to a
linalg.copy and replacing the former with the latter. After code
generation, it is helpful to lower named operations to vendor-optimized
libraries.
