[mlir][ArmSME] Add option to only enable streaming mode/ZA if required (#73931)

This adds a `only-if-required-by-ops` flag to the `enable-arm-streaming`
pass. This flag defaults to `false` (which preserves the original
behaviour), however, if set to `true` the pass will only add the
selected ZA/streaming mode to functions that contain ops that implement
`ArmSMETileOpInterface`.

This simplifies enabling these modes, as we can now first try lowering
ops to ArmSME, then only if we succeed, add the relevant function
attributes.

0 files changed, 0 insertions, 0 deletions