rotating left and right, which are defined using compiler intrinsics, if available. The patch is contributed by Michael Moy <mmoy@yahoo.com>. r=brendan,wtc Modified files: prbit.h plhash.c git-svn-id: svn://10.0.0.236/trunk@244061 18797224-902f-48f8-a5cc-f745e15eee43