Roll src/third_party/swiftshader 8cef397d7dec..77090261dabc (7 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/8cef397d7dec..77090261dabc

git log 8cef397d7dec..77090261dabc --date=short --first-parent --format='%ad %ae %s'
2020-03-25 capn@google.com Identify image views based on their state
2020-03-25 capn@google.com Provide packed VkFormat to uint8_t mapping
2020-03-25 capn@google.com Uniquely identify sampler state
2020-03-25 capn@google.com Split vk::Sampler state off into a structure
2020-03-25 capn@google.com Fix handling Memset<> assignment and comparison
2020-03-25 bclayton@google.com Add script for updating llvm 10
2020-03-25 amaiorano@google.com regres: add daily run against SwiftShader/Subzero

Created with:
  gclient setdep -r src/third_party/swiftshader@77090261dabc

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: Ib0d231221c19750a1c8f314bc3aad1fd13ef930c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120909Reviewed-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@{#753381}

DEPS

@@ -191,7 +191,7 @@ 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': '8cef397d7dec8a8d4c5c7ab257655dc093e3bfa5',
+  'swiftshader_revision': '77090261dabcf44c7b5a0f97bdf35e812a13a66a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.