[Bug ipa/123517] [16 regression] infinite loop in ext-dce (due to miscompiling of ext-dce with -O3 -march=native) while compiling _gcov_execl.i since r16-6652

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123517

--- Comment #8 from Sam James <sjames at gcc dot gnu.org> ---
Not managed to repro manually yet but some packages are broken too, I'll get a
testcase from that.