Updated the build_hash_tbl kernel to avoid using a non-integeral type as an index into an array.
Updated the build_hash_tbl kernel to avoid using a non-integeral type as an index into an array.

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