Address hung tests in Linux.

Follow-up patch coming to address test failures exposed by this change.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@206618 91177308-0d34-0410-b5e6-96231b3b80d8
Fix TestPtrRef2Typedef with new const adornment on expected ref type.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@206619 91177308-0d34-0410-b5e6-96231b3b80d8
Marked TestAttachResume.process_attach_continue_interrupt_detach() as XFAIL on Linux per pr19478.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@206620 91177308-0d34-0410-b5e6-96231b3b80d8