574f77a1ee
PR #143720 adds a requirement to the ACC dialect that every acc.loop must have a seq, independent, or auto attribute for the 'default' device_type. The standard has rules for how this can be intuited: orphan/parallel/parallel loop: independent kernels/kernels loop: auto serial/serial loop: seq, unless there is a gang/worker/vector, at which point it should be 'auto'. This patch implements all of this rule as a 'cleanup' step on the IR generation for combined/loop operations. Note that the test impact is much less since I inadvertently have my 'operation' terminating curley matching the end curley from 'attribute' instead of the front of the line, so I've added sufficient tests to ensure I captured the above.
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.