[XLA] [NFC] Include hash comparison into equality function in order to guarantee an absl hashtable is used with consistent hash/eq functors.
[XLA] [NFC] Include hash comparison into equality function in order to guarantee an absl hashtable is used with consistent hash/eq functors.

`eq(k1, k2) -> hash(k1) == hash(k2)` must be true for hashtable usage to be valid.
