Roll src/third_party/SPIRV-Tools/src a9624b4d5d0b..9e52bc0d0c1d (8 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/a9624b4d5d0b..9e52bc0d0c1d

git log a9624b4d5d0b..9e52bc0d0c1d --date=short --first-parent --format='%ad %ae %s'
2020-02-04 bclayton@google.com utils/vscode: LSP - Support OpExtInst (#3140)
2020-02-04 kubak@google.com Fix typos in opt's help. Update environment version. (#3170)
2020-02-04 stevenperron@google.com Start SPIRV-Tools v2020.2
2020-02-04 stevenperron@google.com Finalize SPIRV-Tools v2020.1
2020-02-04 stevenperron@google.com Update CHANGES
2020-02-04 afdx@google.com spirv-fuzz: Fuzzer pass to add composite types (#3171)
2020-02-04 afdx@google.com Update script that checks copyright years. (#3173)
2020-02-04 afdx@google.com spirv-fuzz: Disallow copying of null and undefined pointers (#3172)

Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@9e52bc0d0c1d

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,cnorthrop@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,cnorthrop@google.com
Change-Id: I3431737acb0df5ec530bc78909bfe7016c53b91c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038123Reviewed-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@{#738516}

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': 'a9624b4d5d0bb1617d6e20dbaba174b07cee18ee',
+  'spv_tools_revision': '9e52bc0d0c1d6a54eedabdfc5f9850c8d2cba2f8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.