Also allow comparing SOA pointers against each other

This compares the data pointer *and* the index.

```odin
package scratch

import "core:fmt"

Foo :: struct {a, b: int}

main :: proc() {
    a := new(#soa[dynamic]Foo)
    a^ = make(#soa[dynamic]Foo, 12, 12)

    b := new(#soa[dynamic]Foo)
    b^ = make(#soa[dynamic]Foo, 12, 12)

    fmt.printfln("&a[0]: %p, &b[0]: %p, Same: %v", &a[0], &b[0], &a[0] == &b[0]) // Same: false
    fmt.printfln("&a[0]: %p, &b[0]: %p, Same: %v", &a[0], &b[1], &a[0] == &b[1]) // Same: false
    fmt.printfln("&a[0]: %p, &b[0]: %p, Same: %v", &a[0], &b[2], &a[0] == &b[2]) // Same: false

    fmt.printfln("&a[0]: %p, &a[1]: %p, Same: %v", &a[0], &a[1], &a[0] == &a[1]) // Same: false
    fmt.printfln("&a[1]: %p, &a[2]: %p, Same: %v", &a[1], &a[2], &a[1] == &a[2]) // Same: false
    fmt.printfln("&a[2]: %p, &a[3]: %p, Same: %v", &a[2], &a[3], &a[2] == &a[3]) // Same: false

    fmt.printfln("&a[0]: %p, &a[0]: %p, Same: %v", &a[0], &a[0], &a[0] == &a[0]) // Same: true
    fmt.printfln("&a[1]: %p, &a[1]: %p, Same: %v", &a[1], &a[1], &a[1] == &a[1]) // Same: true
    fmt.printfln("&a[2]: %p, &a[2]: %p, Same: %v", &a[2], &a[2], &a[2] == &a[2]) // Same: true
}
```

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