Added back member initialization for m_batch_command_mode, which was most likely removed accidentally a while back.

The consequence occurred recently probably due to our swicth to build with c++11.
This fixed 3 test failures.

llvm-svn: 161625

lldb/source/Interpreter/CommandInterpreter.cpp

@@ -80,6 +80,7 @@ CommandInterpreter::CommandInterpreter
     m_script_interpreter_ap (),
     m_comment_char ('#'),
     m_repeat_char ('!'),
+    m_batch_command_mode (false),
     m_truncation_warning(eNoTruncation),
     m_command_source_depth (0)
 {