meta/sso: Update meta to save and restore SSO state.

meta/sso: Update meta to save and restore SSO state.

save and restore _Shader/Pipeline binding point. Rational we don't want any
conflict when the program will be unattached.

V2: formatting improvement

V3 (idr):
* Build fix.  The original patch added calls to _mesa_use_shader_program
  with 4 parameters, but the fourth parameter isn't added to that
  function until a much later patch.  Just drop that parameter for now.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>