Roll third_party/externals/swiftshader 7c33e88..b47c816 (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/7c33e88eebb5..b47c816ad7e6


git log 7c33e88..b47c816 --date=short --no-merges --format='%ad %ae %s'
2019-02-25 chrisforbes@google.com Remove remnants of non-descriptor UBO support
2019-02-25 chrisforbes@google.com Remove remnants of GL-style user clip planes
2019-02-25 chrisforbes@google.com Remove transform feedback remnants


Created with:
  gclient setdep -r third_party/externals/swiftshader@b47c816ad7e6

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: I7ce7224709fc75fbb50bf8ca1122fcc8bace9bf1
Reviewed-on: https://skia-review.googlesource.com/c/194735
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -28,7 +28,7 @@ deps = {
   "third_party/externals/sfntly"          : "https://chromium.googlesource.com/external/github.com/googlei18n/sfntly.git@b55ff303ea2f9e26702b514cf6a3196a2e3e2974",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@661ad91124e6af2272afd00f804d8aa276e17107",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@e9e4393b1c5aad7553c05782acefbe32b42644bd",
-  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@7c33e88eebb5a5e5c66363f4e35616fca5979fe7",
+  "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@b47c816ad7e6b7643b5491d6b0b3f373e316844c",
   #"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@937a7810227adaa02d7933b79dd87b6afa30bc78",
   "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@47af7c547f8551bd25424e56354a2ae1e9062859",