Deterministically set the non-public DR slots used by DR mangling to number <num_spill_slots> in drreg, regardless of whether DR slots are ordered low to high or high to low.
Issue: #2941 (closed), #2933
Deterministically set the non-public DR slots used by DR mangling to number <num_spill_slots> in drreg, regardless of whether DR slots are ordered low to high or high to low.
Issue: #2941 (closed), #2933