Roll src/third_party/tint/src/ bc80805c4..5e7ef27ca (9 commits)

https://dawn.googlesource.com/tint.git/+log/bc80805c4b04..5e7ef27ca7b1

$ git log bc80805c4..5e7ef27ca --date=short --no-merges --format='%ad %ae %s'
2020-08-12 sarahmashay [ast] Adds get last statement to ast::Function
2020-08-12 sarahmashay [validation] Validates functions return statement
2020-08-12 dsinclair Minor updates to fix compilation.
2020-08-12 dsinclair Change output of string based data from sample app.
2020-08-12 idanr Find un-named entry points, change set number
2020-08-12 idanr Add instance step mode to vertex pulling transform
2020-08-12 idanr Add vertex pulling transform
2020-08-11 sarahmashay [validation] Validates declaration name uniqueness
2020-08-11 dsinclair Disable failing tests

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

Change-Id: I7c90331c548043eecaa6c27ba9532b6a97c15794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353570
Commit-Queue: Austin Eng <enga@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797501}

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': 'bc80805c4b04d0e8cd9dad12bef32927363b9787',
+  'tint_revision': '5e7ef27ca7b1ddedd9a9553bc873e4034cd0c735',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,