[Bug bootstrap/83396] [8 Regression] Bootstrap failures with Statement Frontiers

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83396

--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
https://sourceware.org/ml/libc-testresults/2017-q4/msg00460.html

shows GCC build failures on alpha, hppa, ia64, m68k, microblaze, sh, 
tilegx, tilepro.  (The cases where the GCC build completed but the glibc 
build failed are unrelated and should now be fixed in glibc.)

I haven't verified that all of these are caused by the SFN changes, but it 
seems plausible they are.