Roll third_party/externals/swiftshader 4fd7fccd6db5..6d29348ddb7e (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/4fd7fccd6db5..6d29348ddb7e

git log 4fd7fccd6db5..6d29348ddb7e --date=short --first-parent --format='%ad %ae %s'
2019-12-19 sugoi@google.com Enable filtering depth only formats
2019-12-19 bclayton@google.com Kokoro: Add style presubmit checks
2019-12-19 swiftshader.regress@gmail.com Regres: Update test lists @ 4fd7fccd

Created with:
  gclient setdep -r third_party/externals/swiftshader@6d29348ddb7e

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-skia-autoroll
Please CC borenet@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Cq-Include-Trybots: skia/skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
Tbr: borenet@google.com
Change-Id: I04f33e854b9be6ed92e73b8def081ee5419011a3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261214
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
1 file changed