Roll third_party/externals/swiftshader 748ad200897b..34e16df059f8 (6 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/748ad200897b..34e16df059f8

git log 748ad200897b..34e16df059f8 --date=short --first-parent --format='%ad %ae %s'
2020-01-27 sugoi@google.com Revert "VK_EXT_shader_stencil_export support"
2020-01-27 sugoi@google.com Sample location fix
2020-01-27 capn@google.com Avoid ignoring unsuccessful routine creation
2020-01-27 capn@google.com Implement byte swizzle operations
2020-01-27 bclayton@google.com Docs: Add VulkanShaderDebugging.md
2020-01-27 sugoi@google.com VK_EXT_shader_stencil_export support

Created with:
  gclient setdep -r third_party/externals/swiftshader@34e16df059f8

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 reed@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: reed@google.com
Change-Id: I892d0993e68a9d7e9960a44a46cb04e0934d2931
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266980
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