Index: include/llvm/ADT/STLExtras.h
===================================================================
--- include/llvm/ADT/STLExtras.h
+++ include/llvm/ADT/STLExtras.h
@@ -386,6 +386,13 @@
   return std::find(Range.begin(), Range.end(), val);
 }
 
+/// Returns true if \p Container contains \p Element.
+template <typename T, typename E>
+bool contains(const T &Container, const E &Element) {
+  return std::find(Container.begin(), Container.end(), Element) !=
+         Container.end();
+}
+
 //===----------------------------------------------------------------------===//
 //     Extra additions to <memory>
 //===----------------------------------------------------------------------===//