Roll SwiftShader from 4568d8587998 to 74cc8ea2b8df (2 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/4568d8587998..74cc8ea2b8df

2020-08-04 capn@google.com Remove VK_KHR_16bit_storage support
2020-08-03 capn@google.com Replace github.com code links with cs.opensource.google

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 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/master/autoroll/README.md

Bug: None
Tbr: geofflang@google.com
Change-Id: I64aac2a5b9ac6b84446ff5ec30d7552785d65900
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2336513
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -222,7 +222,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@4568d8587998b3db6c25ba7def35105ee1c31f42',
+    'url': '{swiftshader_git}/SwiftShader@74cc8ea2b8df3e6e43430cfcfd71d47f7bef39f9',
     'condition': 'not build_with_chromium',
   },