integrate cfgperl changes#6252..6260 into mainline

integrate cfgperl changes#6252..6260 into mainline

p4raw-link: @6260 on //depot/cfgperl: fc865a0069737312ca5ef9762fe8a9be7aa37747
p4raw-link: @6252 on //depot/cfgperl: 0e4dedf1581344244dfa297db1d00c01c5f821aa

p4raw-id: //depot/perl@6362
p4raw-integrated: from //depot/cfgperl@6361 'copy in'
	t/pragma/constant.t (@5717..) t/op/pack.t t/pragma/warn/op
	(@5996..) pp_proto.h (@6243..) t/op/my_stash.t (@6250..)
	lib/IPC/Open3.pm (@6253..) 'ignore' t/pragma/warn/regcomp
	(@6241..) lib/Exporter.pm (@6251..)
p4raw-integrated: from //depot/cfgperl@6260 'copy in' pp.c (@6217..)
	pod/perlfunc.pod (@6248..)
p4raw-integrated: from //depot/cfgperl@6259 'copy in' MANIFEST
	(@6250..)
p4raw-integrated: from //depot/cfgperl@6257 'copy in' op.c (@6228..)
	'merge in' sv.c (@6244..)
p4raw-integrated: from //depot/cfgperl@6256 'copy in' doop.c (@6254..)
p4raw-integrated: from //depot/cfgperl@6254 'copy in' t/op/tr.t
	(@6192..) 'ignore' embedvar.h objXSUB.h (@6243..) 'merge in'
	embed.h (@6243..) embed.pl proto.h (@6250..)