Roll Tint from 4311dd05c883 to f2b8b6e87396 (2 revisions)

https://dawn.googlesource.com/tint.git/+log/4311dd05c883..f2b8b6e87396

2020-10-14 dsinclair@chromium.org Emit validation errors after outputing result.
2020-10-14 dsinclair@chromium.org [spirv-writer] Fixes to constant constructor determination.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/tint-chromium-autoroll
Please CC enga@google.com on the revert to ensure that a human
is aware of the problem.

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/master/autoroll/README.md

Bug: None
Tbr: enga@google.com
Change-Id: I7a0bc5951cca552085131e0eab0e1b8f0f50a0a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2471146Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#817089}

DEPS

@@ -361,7 +361,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': '4311dd05c88383457ef092ab424ae34e009c5700',
+  'tint_revision': 'f2b8b6e8739662cd19c33500f6415ff2f5ba6d58',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,