Roll src/third_party/SPIRV-Tools/src d80259d35e66..0c172a6b74fc (3 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/d80259d35e66..0c172a6b74fc


git log d80259d35e66..0c172a6b74fc --date=short --no-merges --format='%ad %ae %s'
2018-12-03 dneto@google.com Allow Float16/Int8 for Vulkan 1.0 (#2153)
2018-12-03 stevenperron@google.com Validate uses of ids defined in unreachable blocks. (#2146)
2018-12-03 dneto@google.com Set expected version number for cpp interface test (#2154)


Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@0c172a6b74fc

The AutoRoll server is located here: https://autoroll.skia.org/r/spirv-tools-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=dsinclair@chromium.org

Change-Id: I5db1b8128d90e2c2e38f3b1156d74859c780205e
Reviewed-on: https://chromium-review.googlesource.com/c/1358762Reviewed-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@{#613279}

DEPS

@@ -220,7 +220,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'spv_tools_revision': 'd80259d35e667fda291adf32c5fd29efda976999',
+  'spv_tools_revision': '0c172a6b74fcf0baf221e8eb70b5c7c4d8b47088',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.