[AMDGPU] Fix inconsistencies in RP tracking advance/reset behavior (#196595) Some of the variants of `advance` and `reset` in the `GCNRPTracker` and `GCNDownwardRPTracker` had unclear/inconsistent semantics on their return value. This aims to clarify that through improved documentation and light functional changes. These inconsistencies ultimately triggered an assert in `GCNRPTaget::saveRP` on a complex kernel during scheduling. `GCNScheduleDAGMILive::getRealRegPressure` would incorrectly return a null pressure for a non-empty region which only had debug values. Such regions can arise if the `PreRARematStage` rematerializes all non-debug instructions out of their original region, leaving only debug values. Attempting to rematerialize registers across that same region afterwards would trigger the assert.
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