Roll-back r250822.

Summary: It breaks the build for the ASTMatchers

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D13893

llvm-svn: 250827
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index db658de..c4e1b26 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -56,7 +56,7 @@
   ArrayRef<T> Arr;
 };
 struct MatchesAlways {
-  MatchesAlways() = default;
+  MatchesAlways() {}
   template <class T> bool operator()(T) { return true; }
 };