Roll third_party/externals/spirv-cross/ d573a95a9..7778792ae (15 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross/+log/d573a95a9c65..7778792aec71

$ git log d573a95a9..7778792ae --date=short --no-merges --format='%ad %ae %s'
2020-07-28 post GLSL: Add option to force flattening IO blocks.
2020-07-23 tommek Adding BuiltInSampleMask in HLSL
2020-07-22 tommek Enabling setting a fixed sampleMask in Metal fragment shaders.
2020-02-20 cdavis MSL: Add support for processing more than one patch per workgroup.
2020-07-22 dsinclair Roll GLSLang, SPIRV-Headers and SPIRV-Tools.
2020-07-22 cdavis MSL: Factor creating a uint type into its own method.
2020-07-22 cdavis MSL: Factor a really gnarly condition into its own method.
2020-07-11 post MSVC 2013: Fix silently broken builds.
2020-07-07 troughton MSL: Ensure OpStore source operands are marked for inclusion in function arguments
2020-07-06 dsinclair Roll deps.
2020-07-01 post MSL: Do not emit swizzled writes in packing fixups.
2020-07-01 post MSL: Workaround broken vector -> scalar access chain in MSL.
2020-07-06 post MSL: Use input attachment index directly for resource index fallback.
2020-07-06 post GLSL: Support I/O flattening with arrays as final type.
2020-07-03 post GLSL: Support multi-level struct flattening for I/O.

Created with:
  roll-dep third_party/externals/spirv-cross

Change-Id: Idcbbea05932944da3ca4ec6041030d627a325e82
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306476
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>

Author: Kangz

DEPS

@@ -34,7 +34,7 @@ deps = {
   "third_party/externals/piex"            : "https://android.googlesource.com/platform/external/piex.git@bb217acdca1cc0c16b704669dd6f91a1b509c406",
   "third_party/externals/sdl"             : "https://skia.googlesource.com/third_party/sdl@5d7cfcca344034aff9327f77fc181ae3754e7a90",
   "third_party/externals/sfntly"          : "https://chromium.googlesource.com/external/github.com/googlei18n/sfntly.git@b55ff303ea2f9e26702b514cf6a3196a2e3e2974",
-  "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@d573a95a9c65cf0ab76c0c206e3b01fa47235836",
+  "third_party/externals/spirv-cross"     : "https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross@7778792aec717e982cbe07009e4db1de706f6619",
   "third_party/externals/spirv-headers"   : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Headers.git@c0df742ec0b8178ad58c68cff3437ad4b6a06e26",
   "third_party/externals/spirv-tools"     : "https://skia.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git@e95fbfb1f509ad7a7fdfb72ac35fe412d72fc4a4",
   "third_party/externals/swiftshader"     : "https://swiftshader.googlesource.com/SwiftShader@dc8e77f0e52145b7e0c63eb36c1482e66b87fbff",