Roll SwiftShader from c73969d73ff9 to 16f4b38bdc03 (3 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/c73969d73ff9..16f4b38bdc03

2022-01-05 capn@google.com Emit function attribute "coroutine.presplit" for coroutines
2022-01-05 capn@google.com Avoid passing around the SamplerFunction as a parameter
2022-01-05 capn@google.com Refactor mipmap selection

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 alanbaker@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: alanbaker@google.com
Change-Id: I0409337610408aca0b170b1f93c5cfa4b0f96d3d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/75440
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@c73969d73ff90a54487df765f0fdb12d3583b344',
+    'url': '{swiftshader_git}/SwiftShader@16f4b38bdc034f5524cbf0cfd196a98a60a4b98b',
     'condition': 'dawn_standalone',
   },