[cvs-nhc98] patch applied (yhc): Add reduceRecursiveLet, alongside removeRecursiveLet, and isCoreLetRec

[Neil Mitchell]

Fri Aug  3 08:49:07 PDT 2007  Neil Mitchell
  * Add reduceRecursiveLet, alongside removeRecursiveLet, and isCoreLetRec

    M ./src/libraries/core/Yhc/Core/Invariant.hs -5 +1
    M ./src/libraries/core/Yhc/Core/Invariant/RecursiveLet.hs -6 +20