https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66745
--- Comment #5 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> --- I've had a look at it - however it's not an area that I've worked in before, so beware it will take me a while to understand the issue here. If someone can help with a reduced testcase that would be appreciated.
