message: Update EM comment
  Small PR to update a comment in the execution manager to reflect that the ZERO_ADDRESS is not an EVM precompile, though they are treated the same.
diff: @@ -911,7 +911,8 @@ contract OVM_ExecutionManager is iOVM_ExecutionManager, Lib_AddressResolver {
  bytes memory _returndata
  )
  {
  - // EVM precompiles have the same address on L1 and L2 --> no trie lookup needed.
  +
  + // Both 0x0000... and the EVM precompiles have the same address on L1 and L2 --> no trie lookup needed.
  address codeContractAddress =
  uint(_contract) < 100
  ? _contract
  