Add a default-value bool flag pretty_print to the StructuredData Dump methods.

They will dump pretty-print (indentation, extra whitepsace) by default.  
I'll make a change to ProcessGDBRemote soon so it stops sending JSON strings
to debugserver pretty-printed; it's unnecessary extra bytes being sent between
the two.

llvm-svn: 276079

lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h

@@ -60,7 +60,7 @@ public:
         return GetValue() && GetValue() != Py_None;
     }
 
-    void Dump(Stream &s) const override;
+    void Dump(Stream &s, bool pretty_print = true) const override;
 
 private:
     DISALLOW_COPY_AND_ASSIGN(StructuredPythonObject);