fix(contracts): remove no-op address setting from AddressSetter

packages/contracts/deploy/110-AddressSetter.deploy.ts

 /* Imports: External */
 import { DeployFunction } from 'hardhat-deploy/dist/types'
+import { hexStringEquals } from '@eth-optimism/core-utils'
 
 /* Imports: Internal */
 import {
@@ -13,8 +14,7 @@ const deployFn: DeployFunction = async (hre) => {
 
   // ToDo: Clean up the method of mapping names to addresses esp.
   // There's probably a more functional way to generate an object or something.
-  // ToDo: in the case of an upgrade, only add names of contracts that are new deployed.
-  const names = [
+  const allContractNames = [
     'ChainStorageContainer-CTC-batches',
     'ChainStorageContainer-SCC-batches',
     'CanonicalTransactionChain',
@@ -25,28 +25,48 @@ const deployFn: DeployFunction = async (hre) => {
     'Proxy__OVM_L1StandardBridge',
   ]
 
-  const addresses = await Promise.all(
-    names.map(async (n) => {
-      return (await getLiveContract(hre, n)).address
+  let namesAndAddresses: {
+    name: string
+    address: string
+  }[] = await Promise.all(
+    allContractNames.map(async (name) => {
+      return {
+        name,
+        address: (await getLiveContract(hre, name)).address,
+      }
     })
   )
 
-  // Add non-deployed addresses to the Address Setter argument arrays
+  // Add non-deployed addresses to the Address Setter arguments.
+  namesAndAddresses = [
+    ...namesAndAddresses,
     // L2CrossDomainMessenger is the address of the predeploy on L2. We can refactor off-chain
     // services such that we can remove the need to set this address, but for now it's easier
     // to simply keep setting the address.
-  names.push('L2CrossDomainMessenger')
-  addresses.push(predeploys.L2CrossDomainMessenger)
-
+    {
+      name: 'L2CrossDomainMessenger',
+      address: predeploys.L2CrossDomainMessenger,
+    },
     // OVM_Sequencer is the address allowed to submit "Sequencer" blocks to the
     // CanonicalTransactionChain.
-  names.push('OVM_Sequencer')
-  addresses.push((hre as any).deployConfig.ovmSequencerAddress)
-
+    {
+      name: 'OVM_Sequencer',
+      address: (hre as any).deployConfig.ovmSequencerAddress,
+    },
     // OVM_Proposer is the address allowed to submit state roots (transaction results) to the
     // StateCommitmentChain.
-  names.push('OVM_Proposer')
-  addresses.push((hre as any).deployConfig.ovmProposerAddress)
+    {
+      name: 'OVM_Proposer',
+      address: (hre as any).deployConfig.ovmProposerAddress,
+    },
+  ]
+
+  // Filter out all addresses that will not change, so that the log statement is maximally
+  // verifiable and readable.
+  namesAndAddresses = namesAndAddresses.filter(async ({ name, address }) => {
+    const existingAddress = await Lib_AddressManager.getAddress(name)
+    return !hexStringEquals(existingAddress, address)
+  })
 
   await deployAndPostDeploy({
     hre,
@@ -55,8 +75,12 @@ const deployFn: DeployFunction = async (hre) => {
     args: [
       Lib_AddressManager.address,
       (hre as any).deployConfig.ovmAddressManagerOwner,
-      names,
-      addresses,
+      namesAndAddresses.map((pair) => {
+        return pair.name
+      }),
+      namesAndAddresses.map((pair) => {
+        return pair.address
+      }),
     ],
   })
 }