beacon_node, consensus: fix possible deadlocks when comparing with itself

Author: Chain-Fox

beacon_node/operation_pool/src/lib.rs

@@ -408,6 +408,9 @@ fn prune_validator_hash_map<T, F, E: EthSpec>(
 /// Compare two operation pools.
 impl<T: EthSpec + Default> PartialEq for OperationPool<T> {
     fn eq(&self, other: &Self) -> bool {
+        if self as *const _ == other as *const _ {
+            return true;
+        }
         *self.attestations.read() == *other.attestations.read()
             && *self.attester_slashings.read() == *other.attester_slashings.read()
             && *self.proposer_slashings.read() == *other.proposer_slashings.read()

consensus/proto_array_fork_choice/src/proto_array_fork_choice.rs

@@ -51,6 +51,9 @@ pub struct ProtoArrayForkChoice {
 
 impl PartialEq for ProtoArrayForkChoice {
     fn eq(&self, other: &Self) -> bool {
+        if self as *const _ == other as *const _ {
+            return true;
+        }
         *self.proto_array.read() == *other.proto_array.read()
             && *self.votes.read() == *other.votes.read()
             && *self.balances.read() == *other.balances.read()