patch applied (ghc): Small changes to mk-ing flow graphs

[nr at eecs.harvard.edu]

Wed Sep 19 08:05:44 PDT 2007  simonpj at microsoft.com
  * Small changes to mk-ing flow graphs
  
  - ZipCfg: add mkBlockId :: Unique -> BlockId
  - MkZipCfg: change sequence --> catAGrpahs
  - MkZipCfgCmm: add mkCmmIfThen
  
  Not fully validated, but I don't think anything will break
  
  

    M ./compiler/cmm/Cmm.hs -3 +3
    M ./compiler/cmm/MkZipCfg.hs -4 +4
    M ./compiler/cmm/MkZipCfgCmm.hs -5 +15
    M ./compiler/cmm/ZipCfg.hs -1 +4