stored and restored, and thusly was trounced by the utf8 swash
routines.
p4raw-id: //depot/perl@7937
SAVEI32(PL_reg_oldpos); /* from regexec.c */
SAVEVPTR(PL_reg_oldcurpm); /* from regexec.c */
SAVEVPTR(PL_reg_curpm); /* from regexec.c */
+ SAVEI32(PL_regnpar); /* () count. */
#ifdef DEBUGGING
SAVEPPTR(PL_reg_starttry); /* from regexec.c */
#endif