Remove two uses of IntMap.size

IntMap.size is O(n). The new code should be slightly more efficient.

The transformation of GHC.CmmToAsm.CFG.calcFreqs.nodeCount can be
described formally as the transformation:

    (\sum_{0}^{n-1} \sum_{0}^{k-1} i_nk) + n
    ==>
    (\sum_{0}^{n-1} 1 + \sum_{0}^{k-1} i_nk)