Define erase forwarding method on traces


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13591 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Analysis/Trace.h b/include/llvm/Analysis/Trace.h
index 35a36a4..7de511f 100644
--- a/include/llvm/Analysis/Trace.h
+++ b/include/llvm/Analysis/Trace.h
@@ -101,6 +101,9 @@
   unsigned                 size() const { return BasicBlocks.size(); }
   bool                    empty() const { return BasicBlocks.empty(); }
 
+  iterator erase(iterator q)               { return BasicBlocks.erase (q); }
+  iterator erase(iterator q1, iterator q2) { return BasicBlocks.erase (q1, q2); }
+
   /// print - Write trace to output stream.
   ///
   void print (std::ostream &O) const;