Making all @expectedFailure markers take an explicit bugnumber annotation. This used to be optional, but that makes it harder to track what tests are failing for what reason. So, make it mandatory, in the form of refusing to run the test suite if annotations are missing

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@220012 91177308-0d34-0410-b5e6-96231b3b80d8