skip integrate of change#6267 from cfgperl into mainline (the

skip integrate of change#6267 from cfgperl into mainline (the
method call optimization is flawed without additional hints
from user about immutableness of @ISA and no runtime method
definitions)

p4raw-link: @6267 on //depot/cfgperl: 4f470f63ec19cae10190b8f3ed622153f261d3b1

p4raw-id: //depot/perl@6364
p4raw-branched: from //depot/cfgperl@6363 'branch in'
	t/op/method2entersub.t
p4raw-integrated: from //depot/cfgperl@6363 'ignore'
	lib/ExtUtils/Install.pm lib/base.pm (@5586..) xsutils.c
	(@5996..)
p4raw-integrated: from //depot/cfgperl@6267 'ignore' t/op/sprintf.t
	(@5717..) perl.h (@6193..) embed.pl (@6254..) op.c (@6257..)
	MANIFEST (@6259..)