[mlir][SCF][GPU] Add DeviceMaskingAttrInterface (#146943) This revision adds DeviceMaskingAttrInterface and extends DeviceMappingArrayAttr to accept a union of DeviceMappingAttrInterface and DeviceMaskingAttrInterface. Support is added to GPUTransformOps to take advantage of this information and lower to block/warpgroup/warp/thread specialization when mapped to linear ids. The revision also connects to scf::ForallOp and uses the new attribute to implement warp specialization. The implementation is in the form of a GPUMappingMaskAttr, which can be additionally passed to the scf.forall.mapping attribute to specify a mask on compute resources that should be active. In the first implementation the masking is a bitfield that specifies for each processing unit whether it is active or not. In the future, we may want to implement this as a symbol to refer to dynamically defined values. Extending op semantics with an operand is deemed too intrusive at this time. --------- Co-authored-by: Oleksandr "Alex" Zinenko <git@ozinenko.com>
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