* decl2.c (min_vis_expr_r, expr_visibility): New.

We weren't properly constraining visibility based on names that appear in
the mangled representation of expressions.  This was made more obvious
by the upcoming unevaluated lambdas patch.

	(min_vis_r): Call expr_visibility.
	(constrain_visibility_for_template): Likewise.

From-SVN: r266054