[llvm] [AMDGPU] Add scheduling mask operand to S_SETPRIO (PR #204850)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm requested changes to this pull request.

This should not be done. s_setprio is a real instruction, and the scheduling boundary masks are a huge hack to start with.  Anything related to scheduling masks needs to be fully contained within the backend and not spread to any more interfaces. The intrinsics should generally correspond directly to a real instruction, without any meta-operands attached. I definitely don't want to have to start maintaining a whole extra set of intrinsics with sched mask pollution 

https://github.com/llvm/llvm-project/pull/204850