Roll src/third_party/swiftshader 8a718cb58343..e53533d6fdf9 (2 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/8a718cb58343..e53533d6fdf9


git log 8a718cb58343..e53533d6fdf9 --date=short --no-merges --format='%ad %ae %s'
2019-02-22 chrisforbes@google.com Silence emit-time warnings for many instructions
2019-02-22 chrisforbes@google.com Remove alpha test plumbing


Created with:
  gclient setdep -r src/third_party/swiftshader@e53533d6fdf9

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
TBR=swiftshader-team+autoroll@chromium.org

Change-Id: If360a019d8901063db1421b683ccaf6d8d65e705
Reviewed-on: https://chromium-review.googlesource.com/c/1483127Reviewed-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@{#634805}

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': '8a718cb583439be15cadf0537552d2b96470b8db',
+  'swiftshader_revision': 'e53533d6fdf9838ecc16842b5e071c132881676a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.