[TIR][Schedule] Method returning the function being worked on #14594
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Cherry-pick of #14593.
PR #11999 introduces the sugar method
work_on
to TIR Schedule, with a fieldfunc_working_on_
newly added to the ScheduleNode. In some cases we may want to know which function a ScheduleNode is working on, which is not supported previously.Therefore, this PR introduces a method to ScheduleNode that returns the function (more accurately, GlobalVar) currently being worked on. With this we are able to know the function being worked on.