video_core: don't execute command lists copied before their channel waited

cce6d44af2 executes each command list entry from a copy of its words taken
at submit. Games submit command lists before writing them: the lists wait
behind a semaphore acquire, and the game writes their commands just before
it releases the acquire (Mario Kart World after present). The copies of
those lists were stale. Pokopia stopped after its first frame on macOS: its
GPU never reached the fence the game spun on (EDEN_NX2_PB_SNAPSHOT=0 made it
run again).

Count each channel's suspensions on an acquire and the resumes after them,
and record the count with each copy. A list copied while its channel was
suspended, or whose channel suspended since, reads guest memory instead.
Lists submitted and run without a wait in between keep the copy.
EDEN_NX2_PB_SNAPSHOT=0 still disables it altogether.

Assisted-by: Claude Sonnet 5.5 (first version); Claude Opus 5.5 (bisect, suspension count, testing and commit message)

0 files changed, 0 insertions, 0 deletions