[Issue 24542] New: actually apply VRP to foreach indices when array is of known length

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24542

          Issue ID: 24542
           Summary: actually apply VRP to foreach indices when array is of
                    known length
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: qs.il.paperinik at gmail.com

Follow-up to Issue 24450

```d
foreach (int i, int x; cond() ? [1,2,3] : [1,2])
{ }
```

should likewise not be an error. The length is not known, but is bounded the
same way `cond() ? 3 : 2` is bounded, and VRP detects that.

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