Use re_erased instead of re_static

Author: spastorino

src/librustc_mir/transform/promote_consts.rs

@@ -969,11 +969,11 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
                             let span = statement.source_info.span;
 
                             let ref_ty = tcx.mk_ref(
-                                tcx.lifetimes.re_static,
+                                tcx.lifetimes.re_erased,
                                 ty::TypeAndMut { ty, mutbl: borrow_kind.to_mutbl_lossy() },
                             );
 
-                            *region = tcx.lifetimes.re_static;
+                            *region = tcx.lifetimes.re_erased;
 
                             let mut projection = vec![PlaceElem::Deref];
                             projection.extend(place.projection);
@@ -997,7 +997,7 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
                             self.extra_statements.push((loc, promoted_ref_statement));
 
                             Rvalue::Ref(
-                                tcx.lifetimes.re_static,
+                                tcx.lifetimes.re_erased,
                                 borrow_kind,
                                 Place {
                                     local: mem::replace(