Roll src/third_party/tint/src/ f18d737b4..bc80805c4 (5 commits)

https://dawn.googlesource.com/tint.git/+log/f18d737b4e93..bc80805c4b04

$ git log f18d737b4..bc80805c4 --date=short --no-merges --format='%ad %ae %s'
2020-08-09 dneto [spirv-writer] Infer and emit matrix layout
2020-08-07 sarahmashay [validation] v-0021: cannot re-assign constants
2020-08-06 sarahmashay [Validation] v-0006: variables must be defined before use
2020-08-05 dneto [spirv-reader] Remove support for NumWorkgroups builtin variable
2020-08-05 sarahmashay [validator] implement variable_stack_

Created with:
  roll-dep src/third_party/tint/src

Change-Id: I3531ae47e02d7b10f2317d40b85052eeb32ee125
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346330
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796578}

DEPS

@@ -357,7 +357,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': 'f18d737b4e9318a1817126852edb6cc596ff1f5e',
+  'tint_revision': 'bc80805c4b04d0e8cd9dad12bef32927363b9787',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,

third_party/tint/README.chromium

@@ -2,7 +2,7 @@ Name: Tint
 Short Name: tint
 URL: https://dawn.googlesource.com/tint
 Version: 0
-Revision: f18d737b4e9318a1817126852edb6cc596ff1f5e
+Revision: bc80805c4b04d0e8cd9dad12bef32927363b9787
 License: Apache 2.0
 License File: LICENSE
 Security Critical: yes