Roll glslang from 0cc27fb68c0e to 78a3c915a1d7 (4 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/0cc27fb68c0e..78a3c915a1d7

2020-06-02 rdb@users.noreply.github.com HLSL: Add better diagnostic when using in/out qualifiers in global scope (#2258)
2020-06-02 rdb@users.noreply.github.com HLSL: Recognize POSITION semantic et al in DX9 compatibility mode (#2255)
2020-06-02 rdb@users.noreply.github.com HLSL: fix handling of uniform qualifier in entry point parameters (#2254)
2020-06-02 40001162+alelenv@users.noreply.github.com Add default descriptorset decoration for acceleration structure (#2257)

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,ynovikov@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

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Change-Id: Ife405f36b088842eee2b3f444165f7d990c73952
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226462Reviewed-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@{#774064}

DEPS

@@ -927,7 +927,7 @@ deps = {
     Var('chromium_git') + '/codecs/libgav1.git' + '@' + 'bf190c43e5c7cc81751867c917a81bc2920be079',
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '0cc27fb68c0e85433d071e627cb5b939065c9e6e',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '78a3c915a1d70cf236588cc3c88f4db0566494a4',
 
   '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'),