Roll Tint from 4a7981e300 to 7b7d69854d (19 revisions)

https://dawn.googlesource.com/tint.git/+log/4a7981e300f3..7b7d69854d8d

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 kainino@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: kainino@google.com
Change-Id: I0da1cdfc21d5b09b196b3e79e01cb225717be218
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/41242
Reviewed-by: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -64,7 +64,7 @@ deps = {
 
   # WGSL support
   'third_party/tint': {
-    'url': '{dawn_git}/tint@4a7981e300f3e61fe0f7cb6e55e993dc3b7c2a93',
+    'url': '{dawn_git}/tint@7b7d69854d8d33c97b48795ec350d783dd09dd6a',
     'condition': 'dawn_standalone',
   },