[PATCH 0/2] Jump threader refactor

[Aldy Hernandez via Gcc-patches]

Hi Jeff.

This is the jump threader overhaul I sent you last year, along with
further refactors for the backwards threader.

The meat of it is in the first patch, which IIRC, you passed through
the Fedora tester multiple times.

OK for trunk?

Aldy