Roll src/third_party/glslang/src 5d0e01d9e7f9..e471df3c9154 (2 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/5d0e01d9e7f9..e471df3c9154

git log 5d0e01d9e7f9..e471df3c9154 --date=short --no-merges --format='%ad %ae %s'
2019-11-06 johnkslang@users.noreply.github.com Merge pull request #1963 from KhronosGroup/revert-7b0e236
2019-11-06 johnkslang@users.noreply.github.com Merge pull request #1966 from dj2/readme

Created with:
  gclient setdep -r src/third_party/glslang/src@e471df3c9154

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,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/+/master/autoroll/README.md

TBR=radial-bots+chrome-roll@google.com,jonahr@google.com

Bug: None
Change-Id: Ie91e0da14a3b85b8061a8f1bacbe4d541592b338
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901486Reviewed-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@{#713073}

DEPS

@@ -978,7 +978,7 @@ deps = {
   },
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '5d0e01d9e7f9fae7609843d00f9fc5f41c3ddfdd',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'e471df3c9154afbf125838201d2cd36cd6bdc708',
 
   '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'),