i#6635 core filter, part 3: record_scheduler_t switch boundaries #6695
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For record_scheduler_t, context switch on encoding boundaries instead of instruction boundaries to avoid splitting up encodings from their instructions.
We end up not supporting unread_last_record() for record_scheduler_t as we do not have the pre-prev record to identify a first encoding in a sequence.
Adds a unit test.
Inserting synthetic tid,pid records so the switches are actually visible will be added separately.
Issue: #6635