i965/blorp: patch jump counters also for endif

i965/blorp: patch jump counters also for endif

No known bugs fixed but this is now in line with fs-generator.
No regresssions on IVB.

Eric further explained that:

  "The endif jump, since it's forward, is just an optimization to
   have set right -- otherwise, the GPU will just step forward
   instruction by instruction until it hits something else that
   updates the per-channel PC."

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>