Updated the multimap class' find function to optionally take a precomputed hash value and custome key comparator.
Updated the multimap class' find function to optionally take a precomputed hash value and custome key comparator.

gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf