[Bug rtl-optimization/83321] Conditional jump or move depends on uninitialised value in ira.c/ira-color.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83321

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> Any idea on which source file it is (or at least a small set of them)?
> What your -march=native is?

It happens almost an any source file, for example most libgcc files
already hit the issue. 
I was testing on gcc67, so march=znver1.