increase SkVMBlitter cache size

The old cache size was arbitrary, and the new one is also
somewhat arbitrary too, a nice round number and enough to
draw this without the overhead of JIT churn:

  viewer -f resources/skottie/skottie-brightnesscontrast-legacy.json

Change-Id: Ia84cea04535b4b88a58295186857cfe815173272
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285863
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed