Add more constant folding cases for min, max, step, smoothstep, mix, clamp, atan, and pow.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22903 e7fa87d3-cd2b-0410-9028-fcbf551c1848
3 files changed