Reverted the "Patch: clear NEXT_INSN, PREV_INSN and JUMP_LABEL on deleted insns"

[Hans-Peter Nilsson]

> Date: Mon, 10 Sep 2007 10:27:48 -0700
> From: "Laurynas Biveinis" <laurynas.biveinis@gmail.com>

> First of all sorry for not realizing the real scope of the changes,
> thus testing on a single architecture only and causing so many
> regressions. And thanks to you for the analysis and revert while I was
> away.

No worries.

> I intend to complete this change, however this time around I will make
> sure that it gets adequate testing. Thanks for the pointers on IRC and
> in the email.

I think the bugfixes you sent can and should be re-applied by
itself, sooner rather than later (giving the "right" idiom a
chance to spread, for one).

Then we can think of how to "poison" the PREV_INSN/NEXT_INSN
fields.

Thanks for being persistent with this cleanup.

brgds, H-P