glsl linker: remove interface block instance names

Convert interface blocks with instance names into flat
interface blocks without an instance name.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/linker.cpp

@@ -1733,6 +1733,12 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
       prog->LinkStatus = true;
    }
 
+
+   for (unsigned int i = 0; i < MESA_SHADER_TYPES; i++) {
+      if (prog->_LinkedShaders[i] != NULL)
+         lower_named_interface_blocks(mem_ctx, prog->_LinkedShaders[i]);
+   }
+
    /* Implement the GLSL 1.30+ rule for discard vs infinite loops Do
     * it before optimization because we want most of the checks to get
     * dropped thanks to constant propagation.