[AMDGPU] Make WaitcntBrackets::simplifyWaitcnt const again (#173390) The original design was: - WaitcntBrackets::simplifyWaitcnt(Wait) updates Wait based on the current state of WaitcntBrackets, removing unnecesary waits. - WaitcntBrackets::applyWaitcnt(Wait) updates WaitBrackets based on Wait, updating the state by applying the specified waits. This was changed by #164357 which started calling applyWaitcnt from simplifyWaitcnt. This patch restores the original design without any significant functional changes. There is some code duplication because both simplifyWaitcnt and applyWaitcnt need to understand how XCNT interacts with other counters like LOADCNT and KMCNT.
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