[Bug ada/77405] SIGBUS from gnatmake in stage 3 (gcc 7.0)

[gnugcc at marino dot st]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77405

--- Comment #8 from John Marino <gnugcc at marino dot st> ---
if that attempt doesn't let you reproduce it, and if it still happens when I
remove that flag, I can start bisecting and see if I can get it to a specific
day or even commit that caused it.  That will obviously take some time though.