Support for run-time loading of compiler plugins.
Updated 2009/1/2 by Anders Bach Nielsen: Added features to implement SIP 00002
Extract all phases supplied by plugins and add them to the phasesSet.
Load all available plugins.
Load all available plugins. Skips plugins that
either have the same name as another one, or which
define a phase name that another one does.
Load a rough list of the plugins.
Load a rough list of the plugins. For speed, it
does not instantiate a compiler run. Therefore it cannot
test for same-named phases or other problems that are
filtered from the final list of plugins.
A description of all the plugins that are loaded
Summary of the options for all loaded plugins