Added a new "module" log channel which covers module creation, deletion, and common module list actions.

Also added a new option for "log enable" which is "--stack" which will print out a stack backtrace for each log line.

This was used to track down the leaking module issue I fixed last week.

llvm-svn: 165438

lldb/source/API/SBCommandInterpreter.cpp

@@ -40,7 +40,7 @@ public:
     m_backend(backend) {}
     
     virtual bool
-    IsRemovable() { return true; }
+    IsRemovable() const { return true; }
     
 protected:
     virtual bool