Hi Andrew,
Your patch caused a regression [1] on aarch64-linux-gnu. Would you please investigate? I did a quick analysis and it seems that the expected 18 for aarch64 is now 17:
$ grep "Jumps threaded" a-ssa-dom-thread-7.c.197t.thread2 Jumps threaded: 17
Let me know if you need any assistance in reproducing these.
Thanks!
[1] https://ci.linaro.org/job/tcwg_gnu_native_check_gcc--master-aarch64-build/56...