Don't lock the IOHandlerList::m_mutex in Debugger::RunIOHandler(...) since if a process is resumed or halted, it will try to push/pop the process IOHandler and it will deadlock.

<rdar://problem/18610852>

llvm-svn: 219620

lldb/source/Core/Debugger.cpp

@@ -914,7 +914,6 @@ Debugger::GetTopIOHandlerControlSequence(char ch)
 void
 Debugger::RunIOHandler (const IOHandlerSP& reader_sp)
 {
-    Mutex::Locker locker (m_input_reader_stack.GetMutex());
     PushIOHandler (reader_sp);
     
     IOHandlerSP top_reader_sp = reader_sp;