Roll src/third_party/SPIRV-Tools/src 7e2cba6a5241..618ee509421f (3 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/7e2cba6a5241..618ee509421f

git log 7e2cba6a5241..618ee509421f --date=short --no-merges --format='%ad %ae %s'
2019-10-30 dneto@google.com Fix some clang-tidy issues in graphics_robust_access_pass (#2998)
2019-10-30 stevenperron@google.com Add description of wrap-opkill. (#3000)
2019-10-30 kubak@google.com [opt] Do not compare optimized binary with an invalidated buffer (#2999)

Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@618ee509421f

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/spirv-tools-chromium-autoroll
Please CC radial-bots+chrome-roll@google.com,ynovikov@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/+/master/autoroll/README.md

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_angle_vk32_deqp_rel_ng;luci.chromium.try:android_angle_vk32_rel_ng;luci.chromium.try:android_angle_vk64_deqp_rel_ng;luci.chromium.try:android_angle_vk64_rel_ng;luci.chromium.try:linux_angle_deqp_rel_ng;luci.chromium.try:linux-angle-rel;luci.chromium.try:win-angle-rel-32;luci.chromium.try:win-angle-rel-64;luci.chromium.try:win-angle-deqp-rel-32;luci.chromium.try:win-angle-deqp-rel-64
TBR=radial-bots+chrome-roll@google.com,ynovikov@google.com

Bug: None
Change-Id: Icae7cd22ac49ce55040477cca0802d593a99c607
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1892047Reviewed-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@{#711185}

DEPS

@@ -291,7 +291,7 @@ 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': '7e2cba6a52415ee478d0e6e56c8699a6fe4a5b03',
+  'spv_tools_revision': '618ee509421ffb349f29d5e19bc4b951456dadbe',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.