[AMDGPU] IGroupLP: Refactor SchedGroup::initSchedGroup (NFC) (#184122) There are three overloaded SchedGroup::initSchedGroup functions, two of which are only used for specific types of SchedGroups, namely SCHED_BARRIER and SCHED_GROUP_BARRIER. This seems to have a led to some confusion since the different functions perform checks which are not needed for their intended restricted use cases. Furthermore, there are several wrong comments surrounding those functions. Simplify the functions and inline the actual initialization parts of the SCHED_BARRIER and SCHED_GROUP_BARRIER variants at their only call sites. Extract a function that finds the candidate SUnits for a given SchedGroup and use this instead of initSchedGroup. Fix comments.
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