[Bug bootstrap/91176] [10 regression] AArch64 bootstrap fails since r273479

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91176

--- Comment #7 from Jan Hubicka <hubicka at ucw dot cz> ---
> FWIW I don't think it was a latent bug though.  Previously all we did
> with debug insns was estimate their size and speed, which are guaranteed
> to come back as zero and thus have no effect.  The reason for the
> comparison failure is the new operand walk.
You are right. Though I certainly did not intend things to work this way
:) Still we did things like propagating constant SSA
names and other work. The loop ought to skip debug stmts.
If the patch bootstrap, it is preapproved.

Honza