fixes from Stephen McCamant that address bugs in change#3612

fixes from Stephen McCamant that address bugs in change#3612
(the optimization shouldn't be enabled in expressions where
the variable is introduced), and fix Deparse to grok the
optimization
	Date: Thu, 29 Jul 1999 21:21:49 -0500 (CDT)
	Message-ID: <14241.3133.979257.953396@alias-2.pr.mcs.net>
	Subject: [PATCH _58] Set OPpTARGET_MY more consistently
	--
	Date: Thu, 29 Jul 1999 22:31:16 -0500 (CDT)
	Message-ID: <14241.7300.181386.763503@alias-2.pr.mcs.net>
	Subject: [PATCH _58] Disable TARGET_MY-ization on variable introduction
	--
	Date: Fri, 30 Jul 1999 22:25:27 -0500 (CDT)
	Message-Id: <199907310326.VAA24376@localhost.frii.com>
	Subject: [PATCH _58, long] B::Deparse (was Re: New warning 'Useless use of...')

p4raw-link: @3612 on //depot/perl: b162f9ead0a98db35cdcfc8c889e344c040c8d8e

p4raw-id: //depot/perl@3854