[cvs-nhc98] * Re-implement IORef directly as a 1-item Vector, to elimi

malcolm: Mon Feb 4 18:46:01 CET 2002 Update of /usr/src/master/nhc/src/prelude/IOExtras In directory hinken:/tmp/cvs-serv8590 Modified Files: DIORef.hs FreezeIOArray.hs IOExtras.hs NewIOArray.hs NewIORef.hs ReadIOArray.hs ReadIORef.hs WriteIOArray.hs WriteIORef.hs Log Message: * Re-implement IORef directly as a 1-item Vector, to eliminate the overhead of the Ix class in a 1-item IOArray. Should be somewhat faster now. * Remove '#ifdef 0' dead code from the IOArray operations.