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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