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);
 }
 
+/// Wrapper function around std::find to detect if an element exists
+/// in a container.
+template <typename R, typename E>
+bool is_contained(R && Range, const E &Element) {
+  return std::find(Range.begin(), Range.end(), Element) != Range.end();
+}
+
 //===----------------------------------------------------------------------===//
 //     Extra additions to <memory>
 //===----------------------------------------------------------------------===//