glsl/lower_ubo_reference: lower UBOs and SSBOs to separate index spaces
glsl/lower_ubo_reference: lower UBOs and SSBOs to separate index spaces

Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler