Print the new eStopReasonExec in stop_reason_to_str.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205496 91177308-0d34-0410-b5e6-96231b3b80d8
Make the fail messages


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205497 91177308-0d34-0410-b5e6-96231b3b80d8