Just a note that, following discussion on IRC, I'll pull this for GCC 14 and resubmit for GCC 15.
There was also pushback on IRC about making the pass opt-in. Enabling it for x86_64 would mean fixing RPAD to use a representation that is more robust against recombination, but as you can imagine, it's kind-of difficult for me to justify spending significant time fixing an issue in the x86_64 port. Jeff's testing suggested that there are also latent issues in the older, less maintained ports. So to get an idea for expectations: would it be a requirement that a GCC 15 submission is enabled unconditionally and all known issues in the ports fixed? Thanks, Richard