[UBSan] XFAIL test added in r219642 on Darwin

llvm-svn: 219699
diff --git a/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp b/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp
index d5130fe..5261e71 100644
--- a/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp
+++ b/compiler-rt/test/ubsan/TestCases/TypeCheck/vptr-virtual-base.cpp
@@ -1,6 +1,9 @@
 // RUN: %clangxx -fsanitize=vptr -fno-sanitize-recover -g %s -O3 -o %t
 // RUN: not %run %t 2>&1 | FileCheck %s
 
+// FIXME: This test produces linker errors on Darwin.
+// XFAIL: darwin
+
 struct S { virtual int f() { return 0; } };
 struct T : virtual S {};