[mlir][linalg] Genericize MapOp (#162742)

This PR modifies the definition of `linalg::MapOp` so that it has the
same structure of `linalg::GenericOp` and all other linalg ops. Mainly,
it adds an `out` bbarg for the body of the op. Although the `out` arg is
never used in the body, there doesn't seem to be much benefit in
specializing the op to exclude it. In fact it only makes things more
complicated because it doesn't align with the `GenericOp` structure. For
example, `linalg-generalize-named-ops` avoided converting `linalg.map`
purely because it didn't have the structure to do so. Moreover, although
some fusion patterns are applied explicitly to `GenericOp`, we can
change them to be applied to the base `LinalgOp` which will enable
fusion for any fusion-compatible linalg op, but that requires the op
having a generic structure. So these changes will enable us to use
existing generic transformation patterns on `MapOp` that weren't
possible before. They can either be applied to `MapOp` directly or
applied after converting to `GenericOp`.

0 files changed, 0 insertions, 0 deletions