Need the following enhancements to command line argument processing:

1) remember the order of the -XX options on the command line
   for processing done after all arguments are read (keeps
   some code localized that deals with multiple arguments)

2) merge the globals and arguments specifications into a single data structure
   (see Fred Oliver's suggestion)

3) process arguments from -XX:Flags= and .hotspotrc files same as
   on the command line