Fixed by r123477.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123478 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/virtual-base-ctor.cpp

 // RUN: %clang_cc1 %s -emit-llvm -o - -O2 | FileCheck %s
-// XFAIL: *
 
 struct B;
 extern B x;