port to tahoe by Nir peleg of CCI

port to tahoe by Nir peleg of CCI

SCCS-vsn: usr.bin/pascal/pdx/breakpoint/bp.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/breakpoint/trinfo.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/command/token.l 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/nextaddr.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/printdata.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/printerror.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/printinst.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/pxerrors.h 5.2
SCCS-vsn: usr.bin/pascal/pdx/machine/setbp.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/main/main.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/object/readsym.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/pstatus.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/pxinfo.h 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/rdwr.c 5.3
SCCS-vsn: usr.bin/pascal/pdx/process/runcont.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/start.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/step.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/ptrace.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/process/process.rep 5.3
SCCS-vsn: usr.bin/pascal/pdx/process/resume.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/runtime/callproc.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/runtime/frame.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/sym/print.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/sym/tree.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/sym/printval.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/symtab/symtab.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/tree/assign.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/tree/build.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/tree/misc.c 5.2
SCCS-vsn: usr.bin/pascal/pdx/tree/eval.c 5.2