Roll src/third_party/SPIRV-Tools/src 8013d477aeac..323a81fc5e30 (3 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/8013d477aeac..323a81fc5e30

git log 8013d477aeac..323a81fc5e30 --date=short --first-parent --format='%ad %ae %s'
2020-01-15 alanbaker@google.com Validate Vulkan 1.2 capabilities
2020-01-15 dneto@google.com Add basic support for Vulkan 1.2: SPV_ENV_VULKAN_1_2
2020-01-14 jaebaek@google.com Fix OpLine bug of merge-blocks pass (#3130)

Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@323a81fc5e30

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,jonahr@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
Bug: None
Tbr: radial-bots+chrome-roll@google.com,jonahr@google.com
Change-Id: If59e23feecc075d0f98777623d5c3b97927dc268
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003823Reviewed-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@{#732387}

DEPS

@@ -296,7 +296,7 @@ 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': '8013d477aeac6b596216b0c68134d11561f8b05f',
+  'spv_tools_revision': '323a81fc5e30e43a04e5e22af4cba98ca2a161e6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.