Added some const as well. This will remove camouflage of the next commit,
which will add the bulk of Array of Array semantics and functionality.
(Note the basic grammar and data structure is already in place.)
Note: This affects any downstream consumers of glslang's traverser. Let me know if there are any issues. Essentially, you will need to change the functions that were pointed to into overriding base-class members instead. See the examples in this check in.
git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24740 e7fa87d3-cd2b-0410-9028-fcbf551c1848
