Summary:
This really is only implemented on Windows, and it requires us to pull
in User32. This was only useful when debugging on lldb-mi on Windows, and there
doesn't seem to be a good reason why using a dialog box is better than what
exists for other platforms.
Reviewers: zturner, jingham, compnerd
Subscribers: ki.stfu
Differential Revision: https://reviews.llvm.org/D56755
llvm-svn: 351276
f510bc7972