James Miller faf1afee16 Further refactor optimization pass handling
This refactors pass handling to use the argument names, so it can be used
in a similar manner to `opt`. This may be slightly less efficient than the
previous version, but it is much easier to maintain.

It also adds in the ability to specify a custom pipeline on the command
line, this overrides the normal passes, however. This should completely
close #2396.
2013-05-29 20:08:20 +12:00
..