Remove type overflow checks from check_const.rs, refs #4220

The checks are now handled by the linter

Author: fhahn

src/librustc/middle/check_const.rs

@@ -199,21 +199,6 @@ pub fn check_expr(v: &mut CheckCrateVisitor,
           }
         }
     }
-    match e.node {
-        ExprLit(@codemap::Spanned {node: lit_int(v, t), _}) => {
-            if (v as u64) > ast_util::int_ty_max(
-                if t == ty_i { sess.targ_cfg.int_type } else { t }) {
-                sess.span_err(e.span, "literal out of range for its type");
-            }
-        }
-        ExprLit(@codemap::Spanned {node: lit_uint(v, t), _}) => {
-            if v > ast_util::uint_ty_max(
-                if t == ty_u { sess.targ_cfg.uint_type } else { t }) {
-                sess.span_err(e.span, "literal out of range for its type");
-            }
-        }
-        _ => ()
-    }
     visit::walk_expr(v, e, is_const);
 }