Add an analysis function for inst schedule pass

[leonling-ll]

Current Instruction Schecule pass is controlled by environment variable TRITON_INTEL_ENABLE_INSTR_SCHED.
To remove it we still need a extra analysis function for like register pressure based on given patterns. So that we can make decision automatically whether enable instruction scheduling in the lowering pipeline or not.

[whitneywhtsang]

Given that IGC is able to get most of the performance gain from instruction scheduling, IMO we can close this issue.

[leonling-ll]

Yes, I think we can close this issue after we verify the performance gain with the new published IGC version.

[whitneywhtsang]

Awaiting agama 996.