https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101511
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> --- I've had a go at a git bisect, but couldn't produce any sensible answers ;-< Richard seems to think Andrew MacLeod may be helpful, so I am happy to go with that. For the git range I suggested, commits 4c85ff754927c518ed97da5e0221eeea742c9aa7, a03e944e92ee51ae583382079d4739b64bd93b35, ca4d381662c37733b2a1d49d6c8f5fcfc1348f3d and 9d674b735f22aa9cf85629851783ce38f25087b5 are by Andrew.