patch applied (packages/base): Inline Data.Bits.rotate@Int, enables rotate to be constant folded

[Simon Peyton-Jones]

| > Maybe I should update the programming conventions wiki!
|
| Yep, that might be a good idea. Something about providing good text,
| with reproducible examples, and then adding that text as a footnote in
| the source.

OK: here's a draft to improve.

http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle

Simon