Roll src/third_party/SPIRV-Tools/src 715afb0cea5a..8edf3557ca17 (2 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/715afb0cea5a..8edf3557ca17


git log 715afb0cea5a..8edf3557ca17 --date=short --no-merges --format='%ad %ae %s'
2018-10-19 stevenperron@google.com Revert "Add custom target to wrap around custom commands. (#1986)" (#1996)
2018-10-19 sheredom@gmail.com Add validaton for SPV_KHR_8bit_storage + convert to/from floats. (#1990)


Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@8edf3557ca17

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: Ia844635eeb30bb5a5aa5fb961650fb6144e49797
Reviewed-on: https://chromium-review.googlesource.com/c/1291756Reviewed-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@{#601290}

DEPS

@@ -218,7 +218,7 @@ 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': '715afb0cea5a73356ef48c01b0a43cff22ec0540',
+  'spv_tools_revision': '8edf3557ca1751eaa67e991f242d13715f28e68f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.