9abbed0629
Since the names try_relation_openrv() and try_heap_openrv() don't seem quite appropriate, rename the functions to relation_openrv_extended() and heap_openrv_extended(). This is also more general, if we have a future need for additional parameters that are of interest to only a few callers. This is infrastructure for a forthcoming patch to allow get_object_address() to take a missing_ok argument as well. Patch by me, review by Noah Misch.
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