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backwards threader cleanups

From: Aldy Hernandez <aldyh at redhat dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Cc: Jeff Law <law at redhat dot com>
Date: Fri, 1 Sep 2017 16:18:20 -0400
Subject: backwards threader cleanups
Authentication-results: sourceware.org; auth=none

Hi.

Attached are misc cleanups to tree-ssa-threadbackwards.c and friends.
The main gist of the patch is making the path vectors live in the
heap, not GC.  But I also cleaned up some comments to reflect reality,
and renamed VAR_BB which could use a more meaningful name.  Finally, I
abstracted some common code to
register_jump_thread_path_if_profitable() in preparation for some
upcoming work by me :).

Tested on x86-64 Linux.

OK?

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Follow-Ups:
- Re: backwards threader cleanups
  - From: Jeff Law
- Re: backwards threader cleanups
  - From: Trevor Saunders

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