Roll third_party/externals/swiftshader 605f863173b6..cde4dd9601ce (9 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/605f863173b6..cde4dd9601ce

git log 605f863173b6..cde4dd9601ce --date=short --no-merges --format='%ad %ae %s'
2019-08-27 bclayton@google.com Device: Migrate Renderer to Yarn
2019-08-27 bclayton@google.com Device: Don't use a global for the cluster count.
2019-08-27 bclayton@google.com Some minor code tidying.
2019-08-27 bclayton@google.com Pipeline: Use Yarn to make compute multi-threaded.
2019-08-27 bclayton@google.com Vulkan: Build a yarn::Scheduler and pass it down to the vk::Queue.
2019-08-27 bclayton@google.com vk::Queue: Lazily construct Renderers
2019-08-27 bclayton@google.com Yarn: Don't zero-initialize data in Pool<T>::Item::construct()
2019-08-27 chrisforbes@google.com Pass draw-to-draw varying state directly to Renderer::draw
2019-08-27 chrisforbes@google.com Do not expose extensions for KHR_shader_draw_parameters and KHR_variable_pointers

Created with:
  gclient setdep -r third_party/externals/swiftshader@cde4dd9601ce

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 stani@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.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
TBR=stani@google.com
Change-Id: I3e1adee21f0eeeb05798ab2d41e103ad1d285766
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/237657
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index f49bc0f..1c50bc2 100644
--- a/DEPS
+++ b/DEPS
@@ -30,7 +30,7 @@
   "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@53ab2144b90abede33be5161aec5dfc94ddc3caf",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@29c11140baaf9f7fdaa39a583672c556bf1795a1",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@0c4feb643b89d1792b02f7cbef315e9d95633bd7",
-  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@605f863173b69f9cbe40fca2ac1853eb299e8856",
+  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@cde4dd9601ce8ee950b2b3a153d04aa1b0940d9b",
   #"third_party/externals/v8"              : "https://chromium.googlesource.com/v8/v8.git@5f1ae66d5634e43563b2d25ea652dfb94c31a3b4",
   "third_party/externals/wuffs"           : "https://skia.googlesource.com/external/github.com/google/wuffs.git@6ad7d00a262e862549e4963b4a43d148a8285e50",
   "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@47af7c547f8551bd25424e56354a2ae1e9062859",