glslang -> SPV: Use the new TBuiltInVariable instead of string compares to get the type of SPV built in. Also fixed gl_FragData and gl_PrimitiveIDIn.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31226 e7fa87d3-cd2b-0410-9028-fcbf551c1848