Add "thread return -x" to unwind the innermost user called expression (if you happen to have stopped in it due to a crash.)
Make the message when you hit an crash while evaluating an expression a little clearer, and mention "thread return -x".

rdar://problem/13110464


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@174095 91177308-0d34-0410-b5e6-96231b3b80d8