Deallocate 'DeclRefExpr's in correctly formed '#pragma unused'


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index a799169..1bf8444 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -206,5 +206,6 @@
   for (unsigned i = 0; i < NumExprs; ++i) {
     DeclRefExpr *DR = (DeclRefExpr*) Exprs[i];
     DR->getDecl()->addAttr(::new (Context) UnusedAttr());
+    DR->Destroy(Context);
   }
 }