[Bug tree-optimization/126295] New: !(i >= j) && (i < j) for fp should optimize to `i < j` even with trapping

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126295

            Bug ID: 126295
           Summary: !(i >= j) && (i < j) for fp should optimize to `i < j`
                    even with trapping
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
bool f(double i, double j)
{
  return !(i >= j) && (i < j);
}
```

This should just optimize to `return i < j;` with trapping math enabled.
But currently it does not because there is no inverting of `>=` for trapping.
Note `(i < j) && !(i >= j)` is optimized but only due to frange/vrp/dom.

Optimizing this requires some changes in combine_comparisons.