Roll Tint from 6cd6f7462c to 12ed862c7e (11 revisions)

https://dawn.googlesource.com/tint.git/+log/6cd6f7462c49..12ed862c7ef2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/tint-dawn
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: I1f3795be385fd6867bc8d5d4f85efb00f8f2aa9a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/33840
Reviewed-by: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -82,7 +82,7 @@ deps = {
 
   # WGSL support
   'third_party/tint': {
-    'url': '{dawn_git}/tint@6cd6f7462c4932bcea016bb0a2c171aa1f2c5dc1',
+    'url': '{dawn_git}/tint@12ed862c7ef2d64711cb7e5200f9c28992e2cd12',
     'condition': 'dawn_standalone',
   },