Changed a TODO to a 'maybe some time in the future'.

llvm-svn: 149539

libcxxabi/src/private_typeinfo.cpp

@@ -402,7 +402,8 @@ __dynamic_cast(const void* static_ptr,
 			   const __class_type_info* dst_type,
 			   std::ptrdiff_t src2dst_offset)
 {
-    // TODO:  Take advantage of src2dst_offset
+    // Possible future optimization:  Take advantage of src2dst_offset
+    // Currently clang always sets src2dst_offset to -1 (no hint).
 
     // Get (dynamic_ptr, dynamic_type) from static_ptr
     void** vtable = *(void***)static_ptr;