vgsp-sema: m158 make GR busy-defer holds survive and force re-capture (R1 continuation)

r158: the m156 hold fired (entries held, no fabricated release) but the held
entry's next decode is a replay, which suppresses the launch capture, and the
one-shot hold flag consumed the entry on the following pass - the deferred
launches were still lost (channel unregistered before they ran).

Two changes:
- the hold now stays armed for its whole window (re-hold while
  time_before(gr_hold_until)) instead of one-shot per slot;
- the hold arms ch->gr_rehold_idx, and the entry decode forces exactly one
  fresh (non-replay) pass for that slot with ops still suppressed and the
  capture re-enabled, so the deferred launch is captured and forwarded for
  real once the engine's in-flight launch completes.

0 files changed, 0 insertions, 0 deletions