Roll SwiftShader from f066b8ef930f to 6e9eafd34639 (2 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/f066b8ef930f..6e9eafd34639

2022-02-28 capn@google.com Support implicit conversion of Int4 component to Int
2022-02-28 capn@google.com Move Swizzle type definitions into a separate header

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 bclayton@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: bclayton@google.com
Change-Id: I02517ccb292051145d968bbebda9b943f30ed28b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/82260
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@f066b8ef930f30c9ad1746aa0ac63c152debd46d',
+    'url': '{swiftshader_git}/SwiftShader@6e9eafd3463912183cfcac9c2b26bd61ab57a43b',
     'condition': 'dawn_standalone',
   },