Revert of try stosd/w (patchset #2 id:20001 of https://codereview.chromium.org/135506...

Revert of try stosd/w (patchset #2 id:20001 of https://codereview.chromium.org/1355063002/ )

Reason for revert:
boink

Original issue's description:
> try stosd/w
>
> While we're trying things and reverting them, might as well try this too.
>
> BUG=skia:4316
>
> Blinking in and out for perf.skia.org.
> TBR=reed@google.com
>
> Committed: https://skia.googlesource.com/skia/+/3ca0f626a07e9b534d14a2d8213eedb93c5f7534

TBR=mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4316

Review URL: https://codereview.chromium.org/1356983004