Roll third_party/externals/swiftshader 1776af77065f..8c1e8f1fb771 (1 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/1776af77065f..8c1e8f1fb771


git log 1776af77065f..8c1e8f1fb771 --date=short --no-merges --format='%ad %ae %s'
2019-02-25 sugoi@google.com PipelineLayout implementation


Created with:
  gclient setdep -r third_party/externals/swiftshader@8c1e8f1fb771

The AutoRoll server is located here: https://autoroll.skia.org/r/swiftshader-skia-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
TBR=scroggo@google.com

Change-Id: I1240b054f254373ea1183893458853d9fab7b871
Reviewed-on: https://skia-review.googlesource.com/c/195064
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>