Integrate:

Integrate:
[ 23373]
Implement sv_svset _nosteal variants by passing a flag into
sv_set_flags rather than messing with the SvTEMP() flag on either
side of the call.

[ 23374]
The second half of Perl_vwarner is actually a straight cut&paste job
from Perl_vwarn, so convert it into a (tail) call to Perl_vwarn.
cut&paste is bad, m'kay.

[ 23375]
Merge the common code from Perl_vdie and Perl_vwarner into a
S_vdie_common

[ 23376]
Merge code from vdie and vcroak into S_vdie_croak_common
p4raw-link: @23376 on //depot/perl: 3ab1ac99cac69a50df98e9a6b2a9d1217de1d092
p4raw-link: @23375 on //depot/perl: 63315e187a785a8535d1f84110e060293f0f744c
p4raw-link: @23374 on //depot/perl: d13b0d777d6d58b6258c1f4aebb7ed97a4ad3301
p4raw-link: @23373 on //depot/perl: 5fcdf167f4386a3583bf0db9d98b989639295a45

p4raw-id: //depot/maint-5.8/perl@23387
p4raw-integrated: from //depot/perl@23386 'edit in' sv.c (@23368..)
	'merge in' sv.h (@23277..)
p4raw-integrated: from //depot/perl@23375 'edit in' util.c (@23374..)