If a hand-called function is interrupted by hitting a breakpoint, then 
when you continue to finish off the function call, the expression result
will be included as part of the thread stop info.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@212506 91177308-0d34-0410-b5e6-96231b3b80d8
Add docs for the "thread.completed-expression" format entry.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@212507 91177308-0d34-0410-b5e6-96231b3b80d8