Roll src/third_party/swiftshader 8a6dcf76315c..d6e903bdc9ef (1 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/8a6dcf76315c..d6e903bdc9ef

git log 8a6dcf76315c..d6e903bdc9ef --date=short --first-parent --format='%ad %ae %s'
2019-11-28 sugoi@google.com Support multisampled Bresenham lines

Created with:
  gclient setdep -r src/third_party/swiftshader@d6e903bdc9ef

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-chromium-autoroll
Please CC swiftshader-team+autoroll@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: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_chromium_msan_rel_ng;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Bug: chromium:b/142965928
Tbr: swiftshader-team+autoroll@google.com
Change-Id: I80914116433fe994a6682b4cae9b38e9675fcf3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939679Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#719838}

DEPS

@@ -188,7 +188,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.
-  'swiftshader_revision': '8a6dcf76315ca1bd7268cbdb82124dfae90b8237',
+  'swiftshader_revision': 'd6e903bdc9ef8b6d8f29cc753143c72f8b88425d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.