Post-new codegen cleanup

I've started a wiki page to list the cleanup tasks we need to get done 
now that the new codegen is enabled by default.  (since this is a bit 
open-ended and fluid I thought a wiki page would be better than a ticket 
for now).

http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/NewCodeGen/Cleanup

The page is a bit sparse but we can fill in more details as we go along. 
  I haven't done a full analysis of what needs to be done before we can 
remove codeGen/Cg* and cmm/OldCmm yet.

I have started work on CmmParse, but the other tasks are up for grabs. 
If you enjoy deleting code and killing cruft, have at it.

Cheers,
	Simon