Roll SwiftShader from dc1e3d121dbc to 6c1ab2e36382 (2 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/dc1e3d121dbc..6c1ab2e36382

2023-03-14 jif@google.com Update LLVM 16 scripts
2023-03-14 jif@google.com Copy verbatim the scripts for updating LLVM 10.

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,webgpu-developers@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: I702f97c14451e10b3f9299ed2c46e5bef8bc2298
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/124140
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -137,7 +137,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@dc1e3d121dbcf47542bfdcfb726711398b3dfb54',
+    'url': '{swiftshader_git}/SwiftShader@6c1ab2e3638260721c19b33017925f6deb9e30ac',
     'condition': 'dawn_standalone',
   },