Bug: stackoverflow on recursive fragment call

[phob0s-pl]

The normalization which calculates depth is called before operation verification which checks fragment cycle.

The query which fails for federation demo in v2 and v2 is:

fragment badFragment on Review {
  product {
    reviews {
      ... badFragment
    }
  }
}

query {
  topProducts(first:1) {
    reviews {
      ... badFragment
    }
  }
}