Roll SwiftShader from 4db20a80409b to 4998c7b3a2b8 (1 revision)

https://swiftshader.googlesource.com/SwiftShader.git/+log/4db20a80409b..4998c7b3a2b8

2022-02-01 kjlubick@google.com Add explicit copy assignment operators

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 cwallez@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: cwallez@google.com
Change-Id: I2db440b0e25024f8c78bc34ad46990958f14cead
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/78690
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@4db20a80409b207b3e134c93968468b7c3783eb6',
+    'url': '{swiftshader_git}/SwiftShader@4998c7b3a2b8388dbc4338bb84f3a40d8fef533a',
     'condition': 'dawn_standalone',
   },