Roll SwiftShader from c75846ead9a0 to 643179694ec7 (3 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/c75846ead9a0..643179694ec7

2022-05-04 capn@google.com Always enable MemorySanitizer instrumentation for compute routines
2022-05-04 capn@google.com Always enable MemorySanitizer instrumentation for sampling routines
2022-05-03 capn@google.com Handle instrumentation of scalar single-precision (_ss) intrinsics

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 amaiorano@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: amaiorano@google.com
Change-Id: I24727c6ecc00afabd292f99ceaf8eb6aec5e546e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/88822
Kokoro: Kokoro <noreply+kokoro@google.com>
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -132,7 +132,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@c75846ead9a0fdabcc2a567d539b988b71f6cef0',
+    'url': '{swiftshader_git}/SwiftShader@643179694ec75904ae26664bf43d30cf4cd99909',
     'condition': 'dawn_standalone',
   },