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Empty slot spans are typically registered for lazy decommitting, to
avoid perf regression when going back and forth between
decommitted<->active states. However, we haven't observed a perf
difference for single-slot slot spans, in which case better to decommit
them as soon as they become free.

Change-Id: I09e09055dd2b54b17a54ed35f518d72e9a16e310
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549024
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831852}