vchoi_fork

[svn-r2606] Purpose:
    Code Optimization
Description:
    The matrix operations are currently the hot-spot in the library code
    for regular hyperslab operations.
Solution:
    Unrolled loops for 3 of the more heavily used functions
    (H5V_stride_optimize2, H5V_hyper_stride & H5V_hyper_copy) for the common
    cases (i.e. up to 3-D datasets).  This squeezes some more blood out of
    the stone (turnip? :-) and improves the h5hypers.c benchmark on baldric
    by another 20-25%.
Platforms tested:
    Solaris 2.6 (i.e. baldric)