Roll third_party/externals/swiftshader 74d3f371f201..f50cc82b3bed (6 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/74d3f371f201..f50cc82b3bed

git log 74d3f371f201..f50cc82b3bed --date=short --first-parent --format='%ad %ae %s'
2020-02-20 amaiorano@google.com Subzero: add support for large stacks on Windows
2020-02-20 sugoi@google.com VK_EXT_shader_stencil_export support
2020-02-20 bclayton@google.com Remove rr::Thread
2020-02-20 capn@google.com Support JIT on a separate thread
2020-02-20 sugoi@google.com Revert "VK_EXT_shader_stencil_export support"
2020-02-20 sugoi@google.com VK_EXT_shader_stencil_export support

Created with:
  gclient setdep -r third_party/externals/swiftshader@f50cc82b3bed

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 lovisolo@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: lovisolo@google.com
Change-Id: I9a65247e81025da8eee04829b9738e044eaac100
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272544
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