Finish compile-time constant folding for multi-argument built-ins:  distance(), dot(), cross(), faceforward(), reflect(), refract(), and outerProduct().


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24272 e7fa87d3-cd2b-0410-9028-fcbf551c1848