Introduce DelayedCleanupPool useful for simplifying clean-up of certain resources that, while their
lifetime is well-known and restricted, cleaning them up manually is easy to miss and cause a leak.

Use it to plug the leaking of TemplateIdAnnotation objects. rdar://9634138.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133610 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index 39db0e9..154d8fd 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -955,8 +955,7 @@
 
     Token Next = NextToken();
     if (Next.is(tok::annot_template_id)) {
-      TemplateIdAnnotation *TemplateId
-        = static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue());
+      TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
       if (TemplateId->Kind == TNK_Type_template) {
         // We have a qualified template-id that we know refers to a
         // type, translate it into a type and continue parsing as a
@@ -975,8 +974,7 @@
   }
 
   case tok::annot_template_id: { // [C++]          template-id
-    TemplateIdAnnotation *TemplateId
-      = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
+    TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
     if (TemplateId->Kind == TNK_Type_template) {
       // We have a template-id that we know refers to a type,
       // translate it into a type and continue parsing as a cast