Roll third_party/glslang/src d519167d2ecb..6c479796f6e4 (3 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/d519167d2ecb..6c479796f6e4


Created with:
  gclient setdep -r third_party/glslang/src@6c479796f6e4

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/glslang-angle-autoroll
Please CC ianelliot@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: ianelliot@google.com
Change-Id: I0a2e7eff7a803818df5ad331b5ff0fe75eb83588
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1959779
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

Author: angle-autoroll

DEPS

@@ -27,7 +27,7 @@ vars = {
   'vk_gl_cts_revision': '54ec6f2b1390bf33ea10424dca610f8bcbfefa06',
 
   # Current revision of glslang, the Khronos SPIRV compiler.
-  'glslang_revision': 'd519167d2ecb83aee3c57207c144da082c516584',
+  'glslang_revision': '6c479796f6e4a6fa86ca4d25212ae1284c92fef5',
 
   # Current revision of googletest.
   # Note: this dep cannot be auto-rolled b/c of nesting.