Add uint type (big change). For both int/uint, add the operators >>, <<, &,...

Add uint type (big change).  For both int/uint, add the operators >>, <<, &, |, and ^.  Also added unsigned literals and uint precision support.  Also fixed how int/uint literal underflow/overflow is handled.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@21054 e7fa87d3-cd2b-0410-9028-fcbf551c1848