Add libstd++-4.8 exceptions to ubsan_blacklist.txt

Differential Revision: https://reviews.llvm.org/D40589

llvm-svn: 319353

llvm/utils/sanitizers/ubsan_blacklist.txt

@@ -5,3 +5,8 @@
 
 # upcast of address with insufficient space for an object of type std::_Rb_tree_node<...>
 src:*bits/stl_tree.h
+
+# libstdc++ 4.8 creates a null reference when calling
+# data() on an empty vector: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59829
+src:*bits/stl_iterator.h
+src:*bits/stl_vector.h