Added instantiation test for concurrent::pcbuf.
Added instantiation test for concurrent::pcbuf.

takei-yuya/pficommon,takei-yuya/pficommon,retrieva/pficommon,pfi/pficommon,retrieva/pficommon,takei-yuya/pficommon,pfi/pficommon,pfi/pficommon,retrieva/pficommon,pfi/pficommon,retrieva/pficommon,retrieva/pficommon,takei-yuya/pficommon