[lldb-mi] Add possibility to set breakpoints without selecting a target.

Now it's possible to set breakpoints before selecting a target, they
will be set to the dummy target and then copied to an each added one.

Patch by Alexander Polyakov!

Differential Revision: https://reviews.llvm.org/D46588

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@333205 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed