Slicing a static array binds as non-ref when using auto ref

[dlangBugzillaToGithub]

Steven Schveighoffer reported this on 2024-02-10T16:49:35Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=24385

Description

```d
import std.stdio;
void foo(ref int[2] val)
{
    writeln("foo ref");
}

void foo(int[2] val)
{
    writeln("foo non-ref");
}

void bar()(auto ref int[2] val)
{
    static if(__traits(isRef, val))
        writeln("bar ref");
    else
        writeln("bar non-ref");
}

void main()
{
    int[4] x;
    int[2] y;
    foo(y);         // foo ref
    bar(y);         // bar ref
    foo(x[0 .. 2]); // foo ref
    bar(x[0 .. 2]); // bar non-ref
}
```

They should all be ref for consistency.