Roll SwiftShader from f1afdde60a81 to 87c78ac5eb86 (1 revision)

https://swiftshader.googlesource.com/SwiftShader.git/+log/f1afdde60a81..87c78ac5eb86

2021-12-23 penghuang@chromium.org Use X11 shm extension for presenting

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 enga@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: enga@google.com
Change-Id: I91949bea2156d992aaec0e174d387556b02ea19d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/74600
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -121,7 +121,7 @@ deps = {
   },
 
   'third_party/swiftshader': {
-    'url': '{swiftshader_git}/SwiftShader@f1afdde60a81bce2451f208d989637ce09ecfbdb',
+    'url': '{swiftshader_git}/SwiftShader@87c78ac5eb86f1956e1b8cb987b5fceadd1d0def',
     'condition': 'dawn_standalone',
   },