Add support for volatile keyword in mgc version. For Tilera, as we execute a process...

Add support for volatile keyword in mgc version.  For Tilera, as we execute a process on each core, to make all the 'threads' share the volatile field, make it as a shared field in global shared heap like static fields.  Add keywords and rules for enumarated type, but still have bugs and when parsing the test code, the compiler throw errors.