glslang AEP: The extension scheme, extension-enabled stage-existence testing, and compute-shader interface.  Still needs in/out blocks, unsized arrays, etc. before real testing can be done.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31479 e7fa87d3-cd2b-0410-9028-fcbf551c1848