Roll Tint from e07510293160 to 181d8baf8f01 (11 revisions)

https://dawn.googlesource.com/tint.git/+log/e07510293160..181d8baf8f01

2020-12-16 dsinclair@chromium.org Add helper for function creation.
2020-12-16 dsinclair@chromium.org Add helper to create StructMember nodes.
2020-12-16 dsinclair@chromium.org Rename Index and Member builder helpers.
2020-12-15 sarahmashay@google.com fix gcc error: changes meaning of Transform
2020-12-15 bclayton@google.com reader/spirv: Fix permissive GCC warning
2020-12-15 dneto@google.com spirv-writer: Exit gracefully when bad inst outside function
2020-12-15 dsinclair@chromium.org Add symbol to member name.
2020-12-15 bclayton@google.com ast: Make all non-semantic fields const
2020-12-15 bclayton@google.com Start cleaning up tests (5/N)
2020-12-15 bclayton@google.com Start cleaning up tests (4/N)
2020-12-15 bclayton@google.com ast::Builder: Remove zero-init Source constructors

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 rharrison@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

Cq-Include-Trybots: luci.chromium.try:dawn-linux-x64-deps-rel;luci.chromium.try:dawn-mac-x64-deps-rel;luci.chromium.try:dawn-win10-x64-deps-rel;luci.chromium.try:dawn-win10-x86-deps-rel
Bug: None
Tbr: rharrison@google.com
Change-Id: Ic192628f25b759b48f5d8a3163b73db4d7fc1cdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595210Reviewed-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@{#837593}

DEPS

@@ -365,7 +365,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': 'e07510293160f38bfa377467bf182abab99b87a5',
+  'tint_revision': '181d8baf8f016df2a50dd2bf1776c3283f282807',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,