Roll SPIRV-Tools from 0e7fe4d35baf to 4b07d50cd9a0 (10 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/0e7fe4d35baf..4b07d50cd9a0

2020-09-26 antonikarp@google.com spirv-fuzz: Fix bug in TransformationDuplicateRegionWithSelection (#3819)
2020-09-26 andreperezmaselco.developer@gmail.com spirv-fuzz: Support OpNot bit instruction case (#3841)
2020-09-25 afdx@google.com spirv-fuzz: Return IR and transformation context after replay (#3846)
2020-09-24 paulthomson@users.noreply.github.com spirv-fuzz: fix test (#3845)
2020-09-24 afdx@google.com spirv-fuzz: Use unique_ptr<FactManager> in TransformationContext (#3844)
2020-09-24 ehsannas@gmail.com Start SPIRV-Tools v2020.6
2020-09-24 ehsannas@gmail.com Finalize SPIRV-Tools v2020.5
2020-09-24 ehsannas@gmail.com Update CHANGES
2020-09-24 vasniktel@gmail.com spirv-fuzz: Support dead blocks in TransformationAddSynonym (#3832)
2020-09-24 vasniktel@gmail.com spirv-fuzz: Move IRContext parameter into constructor (#3837)

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/+doc/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,jonahr@google.com
Change-Id: Ide53bd1a7338602ee3a5bcbf08a75c210dead45f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434425Reviewed-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@{#811162}

DEPS

@@ -302,7 +302,7 @@ 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': '0e7fe4d35bafc8a73b68835c65bebf766d4f51da',
+  'spv_tools_revision': '4b07d50cd9a0a537ccb28252227f87d36273cf53',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.