Roll SwiftShader from cdf43bd816d7 to 643179694ec7 (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/cdf43bd816d7..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
2022-05-03 nicolascapens@google.com Revert "Always enable MemorySanitizer instrumentation for vertex routines"

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 abdolrashidi@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: abdolrashidi@google.com
Change-Id: Iac0ec36bf22440318a3777613c2ac8fc727d89ac
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3627218
Bot-Commit: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -492,7 +492,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@cdf43bd816d7043e7551409313c203510c729e61',
+    'url': '{swiftshader_git}/SwiftShader@643179694ec75904ae26664bf43d30cf4cd99909',
     'condition': 'not build_with_chromium',
   },