Revert "SkRasterPipeline: 8x pipelines"

This reverts commit I1c82e5755d8e44cc0b9c6673d04b117f85d71a3a.

Reason for revert: lots of failing bots.

TBR=mtklein@chromium.org,msarett@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I653bed3905187f43196504f19424985fa2a765b5
Reviewed-on: https://skia-review.googlesource.com/3063
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
11 files changed