Roll glslang from ed8bd0453f73 to d550bebee919 (3 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/ed8bd0453f73..d550bebee919

2020-11-03 courtneygo@google.com Fix build error with Chromium & ANGLE (#2446)
2020-11-02 dev@creatingtrouble.com Add new SpirvToolsDisassemble API interface + Improve Doc on existing API interface (#2442)
2020-11-02 justsid@widerwille.com Support for CapabilityShaderViewportIndex and CapabilityShaderLayer (#2432)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/glslang-chromium-autoroll
Please CC radial-bots+chrome-roll@google.com,courtneygo@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,courtneygo@google.com
Change-Id: I23d0f1bd2ee18ebc9b77832e8bfb6a7e7e8df8d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517600Reviewed-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@{#823581}

DEPS

@@ -963,7 +963,7 @@ deps = {
     Var('chromium_git') + '/codecs/libgav1.git' + '@' + 'a9449e612bc251b4271bbe1e3a0d12e9809bf74c',
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'ed8bd0453f73095f1e56bbd7b999c5c35f104dac',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'd550bebee919179c9e332a0ab28a67f8fe3ca239',
 
   'src/third_party/google_toolbox_for_mac/src': {
       'url': Var('chromium_git') + '/external/github.com/google/google-toolbox-for-mac.git' + '@' + Var('google_toolbox_for_mac_revision'),