Roll src/third_party/swiftshader 7aafb27453d3..8a718cb58343 (2 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/7aafb27453d3..8a718cb58343


git log 7aafb27453d3..8a718cb58343 --date=short --no-merges --format='%ad %ae %s'
2019-02-22 chrisforbes@google.com Restore vertex fetch state update from context -> state
2019-02-22 chrisforbes@google.com Implement proper handling of constants


Created with:
  gclient setdep -r src/third_party/swiftshader@8a718cb58343

The AutoRoll server is located here: https://autoroll.skia.org/r/swiftshader-chromium-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=luci.chromium.try:android_optional_gpu_tests_rel;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/124177079,chromium:b/124934655
TBR=swiftshader-team+autoroll@chromium.org

Change-Id: I1c69244e7bdfec10372db6a10b3f46de82e388cf
Reviewed-on: https://chromium-review.googlesource.com/c/1483120Reviewed-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@{#634761}

DEPS

@@ -143,7 +143,7 @@ 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': '7aafb27453d352a704ccae3805b43fc6422edaca',
+  'swiftshader_revision': '8a718cb583439be15cadf0537552d2b96470b8db',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.