The humble beginnings of cmm-mode

[Johan Tibell]

Hi,

I've started working on cmm-mode, a mode for reading Cmm, GHC's
internal version of C-- and the output of -ddump-simpl.

https://github.com/tibbe/cmm-mode

While reading compiler output is definitely a minority use case,
perhaps it wouldn't hurt to include the mode so we can eventually add
commands that compile .hs files to .cmm files and show the result in a
buffer.

-- Johan