rustc: merge check_static into check_const.

Author: eddyb

src/librustc/lib.rs

@@ -90,7 +90,6 @@ pub mod middle {
     pub mod check_loop;
     pub mod check_match;
     pub mod check_rvalues;
-    pub mod check_static;
     pub mod const_eval;
     pub mod dataflow;
     pub mod dead;