Roll src/third_party/swiftshader 29cc24586074..503b21fd3203 (1 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/29cc24586074..503b21fd3203

git log 29cc24586074..503b21fd3203 --date=short --first-parent --format='%ad %ae %s'
2020-02-13 swiftshader.regress@gmail.com Regres: Update test lists @ ac4e1d23

Created with:
  gclient setdep -r src/third_party/swiftshader@503b21fd3203

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: None
Tbr: swiftshader-team+autoroll@google.com
Change-Id: Ibb3d955986aad25c1fff1e3d66145f64fff643cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2053297Reviewed-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@{#741142}

DEPS

@@ -187,7 +187,7 @@ 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': '29cc245860746cb9ec174eba4b5f50bc8c6e790d',
+  'swiftshader_revision': '503b21fd3203c7b9607ef3583a0fe32784d5f877',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.