[Bug tree-optimization/114339] [14 regression] Tor miscompiled with -O2 -mavx -fno-vect-cost-model

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114339

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
The assert is at
https://gitlab.torproject.org/tpo/core/tor/-/blob/tor-0.4.8.10/src/feature/client/entrynodes.c#L2072

```
(gdb) p delays
$3 = {{
    maximum = 21600,
    primary_delay = 600,
    nonprimary_delay = 3600
  }, {
    maximum = 345600,
    primary_delay = 5400,
    nonprimary_delay = 14400
  }, {
    maximum = 604800,
    primary_delay = 14400,
    nonprimary_delay = 64800
  }, {
    maximum = 9223372036854775807,
    primary_delay = 32400,
    nonprimary_delay = 129600
  }}
(gdb)
```

The bad loop (confirmed w/ novector pragma) is:
  for (i = 0; i < ARRAY_LENGTH(delays); ++i) {
    if (tdiff <= delays[i].maximum) {
      return is_primary ? delays[i].primary_delay : delays[i].nonprimary_delay;
    }
  }