nir/builder: invalidate metadata per function
Fixes: a62098ff ("nir: Add a helper for general instruction-modifying passes.") Signed-off-by:Marcin Ślusarz <marcin.slusarz@intel.com> Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net> Part-of: <mesa/mesa!12324> (cherry picked from commit e1b325f5)