Roll src/third_party/glslang/src 9b620aa0c12d..4b2483ee88ab (1 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/9b620aa0c12d..4b2483ee88ab

git log 9b620aa0c12d..4b2483ee88ab --date=short --first-parent --format='%ad %ae %s'
2020-03-16 mbechard@users.noreply.github.com Fix #2005. Allow multiple compilation units to declare identical push_constant blocks (#2123)

Created with:
  gclient setdep -r src/third_party/glslang/src@4b2483ee88ab

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,jmadill@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

Bug: None
Tbr: radial-bots+chrome-roll@google.com,jmadill@google.com
Change-Id: Ie9e2fed7147a8549b1cd977f09134c2884dab27e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105577Reviewed-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@{#750603}

DEPS

@@ -944,7 +944,7 @@ deps = {
     Var('chromium_git') + '/codecs/libgav1.git' + '@' + 'fa1c3c4e673cf12ffa22b8fbe4a7c79314571f1b',
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '9b620aa0c12d12dd7ec7ced43ce9e58f275d47c1',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '4b2483ee88ab2ce904f6bac27c7796823c45564c',
 
   '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'),