vgsp-sema r558: the opdef hold path honors the absolute per-launch bound

r557 STALL-DUMP evidence (victory_matmul): "no GPFIFO entry consumed for
20s" repeated while opdef=3880/16/64 and held=155 climbed - the pump
froze on one held entry whose operand never resolved, re-holding it every
pass. The opdef hold was the only pump hold path without the absolute
per-launch-VA bound (svc_gr_hold_bound_expired, the r509 one-shot used by
every GR hold path); it could therefore extend indefinitely through
fresh slot allocations even though each individual slot window is 3 s.

Consult the same absolute bound before holding: once it fires the entry
flushes its withheld releases and is consumed, so no operand-pending entry
can freeze the pump's entry loop.

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