fix fallthrough when deciding lowp/highp

This would toss the _obs mode SkRasterPipelines into highp way too often, and is just a bug.

This fixes most diffs between the jumper and obs modes.  The rest look like FMA changes, and there are no diffs when limited to SSE4.1.

Change-Id: Ib71c2a8c720b8b1e6319d1c3354ea6f4f2d9b77f
Reviewed-on: https://skia-review.googlesource.com/c/180602
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed