Roll SwiftShader from f0e8ec2da282 to 4c687cc2f8ea (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/f0e8ec2da282..4c687cc2f8ea

2021-11-18 srisser@google.com Regres fetches HEAD and truncates deqp.json
2021-11-17 swiftshader.regress@gmail.com Regres: Update test lists @ e068963d
2021-11-17 capn@google.com Add support for VK_FORMAT_B8G8R8A8_UNORM|SRGB as storage image formats
2021-11-16 swiftshader.regress@gmail.com Regres: Update test lists @ f0e8ec2d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-angle-autoroll
Please CC geofflang@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 ANGLE: https://bugs.chromium.org/p/angleproject/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: geofflang@google.com
Change-Id: I6b21e07b8845b9ac9dd640ef296f46488e5abcc6
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3291351
Bot-Commit: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -496,7 +496,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@f0e8ec2da282ebaf1844d0d29067f05c76d550aa',
+    'url': '{swiftshader_git}/SwiftShader@4c687cc2f8ea9d096a66ad43c08805d36a559ede',
     'condition': 'not build_with_chromium',
   },