Inline and remove RegionConstraintStorage::remove_constraint_entry.

It has a single call site.

Author: nnethercote

compiler/rustc_infer/src/infer/region_constraints/mod.rs

@@ -320,29 +320,6 @@ impl<'tcx> RegionConstraintStorage<'tcx> {
 ) -> RegionConstraintCollector<'a,'tcx>{
 RegionConstraintCollector{storage:self, undo_log }
 }
-
-fnrollback_undo_entry(&mutself,undo_entry:UndoLog<'tcx>){
-match undo_entry {
-AddVar(vid) => {
-self.var_infos.pop().unwrap();
-assert_eq!(self.var_infos.len(), vid.index());
-}
-AddConstraint(index) => {
-self.data.constraints.pop().unwrap();
-assert_eq!(self.data.constraints.len(), index);
-}
-AddVerify(index) => {
-self.data.verifys.pop();
-assert_eq!(self.data.verifys.len(), index);
-}
-AddCombination(Glb,ref regions) => {
-self.glbs.remove(regions);
-}
-AddCombination(Lub,ref regions) => {
-self.lubs.remove(regions);
-}
-}
-}
 }
 
 impl<'tcx>RegionConstraintCollector<'_,'tcx>{
@@ -793,6 +770,25 @@ impl<'tcx> RegionConstraintData<'tcx> {
 
 impl<'tcx>Rollback<UndoLog<'tcx>>forRegionConstraintStorage<'tcx>{
 fnreverse(&mutself,undo:UndoLog<'tcx>){
-self.rollback_undo_entry(undo)
+match undo {
+AddVar(vid) => {
+self.var_infos.pop().unwrap();
+assert_eq!(self.var_infos.len(), vid.index());
+}
+AddConstraint(index) => {
+self.data.constraints.pop().unwrap();
+assert_eq!(self.data.constraints.len(), index);
+}
+AddVerify(index) => {
+self.data.verifys.pop();
+assert_eq!(self.data.verifys.len(), index);
+}
+AddCombination(Glb,ref regions) => {
+self.glbs.remove(regions);
+}
+AddCombination(Lub,ref regions) => {
+self.lubs.remove(regions);
+}
+}
 }
 }