Roll SwiftShader from 39fdd0d506bf to 561264b73b36 (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/39fdd0d506bf..561264b73b36

2022-03-04 capn@google.com Remove explicit broadcasts of constants in fragment operations
2022-03-03 capn@google.com Fix obtaining the RelaxedPrecision decoration from the result ID
2022-03-03 natsu@google.com Support VK_FORMAT_G10X6_B10X6R10X6_2PLANE_420_UNORM_3PACK16
2022-03-03 dvet@google.com Update googletest submodule to release-1.11.0

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: I2f71cb34cfe9e21f22da578282b1d8885917ad75
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/82700
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@39fdd0d506bfc673068c27e9ad4ee975fbbd38ed',
+    'url': '{swiftshader_git}/SwiftShader@561264b73b3658773c037fc2d4a392a7cec8137c',
     'condition': 'dawn_standalone',
   },