Roll SwiftShader from 2b76a13c38ae to ad6d7f84f2a1 (1 revision)

https://swiftshader.googlesource.com/SwiftShader.git/+log/2b76a13c38ae..ad6d7f84f2a1

2022-02-06 sugoi@google.com VK_KHR_synchronization2 support

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-dawn-autoroll
Please CC shrekshao@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in SwiftShader: https://bugs.chromium.org/p/swiftshader/issues/entry
To file a bug in Dawn: https://bugs.chromium.org/p/dawn/issues/entry

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/+doc/main/autoroll/README.md

Bug: None
Tbr: shrekshao@google.com
Change-Id: Iaaa2e17fc9a440244bf04aebc61cb01257f65d28
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/79580
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -133,7 +133,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@2b76a13c38ae2f6f4734e1747d4206f8721fc72c',
+    'url': '{swiftshader_git}/SwiftShader@ad6d7f84f2a1e60f1b9769b64bbfaca80cf71192',
     'condition': 'dawn_standalone',
   },