add a range insertion method to SmallSet.

llvm-svn: 70817

llvm/include/llvm/ADT/SmallSet.h

@@ -76,6 +76,12 @@ public:
     return true;
   }
 
+  template <typename IterT>
+  void insert(IterT I, IterT E) {
+    for (; I != E; ++I)
+      insert(*I);
+  }
+  
   bool erase(const T &V) {
     if (!isSmall())
       return Set.erase(V);