Remove pool recycling mechanism.

This is an experiment to see if Windows performance numbers are impacted
by removing the recycler entirely. When pools were > 300K, the cost of
continually creating and destroying the pool in a tight loop was
prohibitive, but now that they are 64K, it's possible that the pool
allocation is less expensive and recycling them might not be worth the
downsides.

Change-Id: I7cf4f00e539310da2f852f36419f12d6904727cf
Bug: skia:10865
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330436
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
4 files changed