Roll src/third_party/SPIRV-Tools/src 7f7236f1eba0..c0e9807094ef (4 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/7f7236f1eba0..c0e9807094ef

git log 7f7236f1eba0..c0e9807094ef --date=short --no-merges --format='%ad %ae %s'
2019-09-10 zoddicus@users.noreply.github.com Handle creating a new constant failing gracefully (#2848)
2019-09-10 afdx@google.com Rework management of probabilities in spirv-fuzz (#2839)
2019-09-10 afdx@google.com Fix add-dead-break and add-dead-continue passes to respect dominance (#2838)
2019-09-10 stevenperron@google.com Handle id overflow in the ssa rewriter. (#2845)

Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@c0e9807094ef

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,syoussefi@chromium.org 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,syoussefi@chromium.org

Bug: None
Change-Id: I5550e6b4bb6d1089aca2a034e55137d097cf38f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797086Reviewed-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@{#695533}

DEPS

@@ -281,7 +281,7 @@ 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': '7f7236f1eba0afae2669ea777896f0435be4c96d',
+  'spv_tools_revision': 'c0e9807094ef6e345ef0a4d5f17af81af063cd27',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.