Add a simple clear() method

llvm-svn: 24543

llvm/include/llvm/Analysis/AliasSetTracker.h

@@ -291,6 +291,11 @@ public:
   bool remove(Instruction *I);
   void remove(AliasSet &AS);
   
+  void clear() {
+    PointerMap.clear();
+    AliasSets.clear();
+  }
+
   /// getAliasSets - Return the alias sets that are active.
   ///
   const ilist<AliasSet> &getAliasSets() const { return AliasSets; }