Remove TIntermediate's dependency on infoSink, simplify folding of constant aggregates, and infoSink use in constant folding.

Added a few deep aggregate constant folding testing cases.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22912 e7fa87d3-cd2b-0410-9028-fcbf551c1848