Make benchmarks compile with latest nightly

[athei]

#7381 missed the benchmarking code. This rectifies that. I just needed to sprinkle some u32 everywhere.

[bkchr]

bot merge

[ghost]

Waiting for commit status.

[TriplEight]

Yes, it works with the latest image. However, there are some warnings in wasm tests:

   Compiling substrate-prometheus-endpoint v0.8.0 (/builds/utils/prometheus)
warning: unused imports: `FutureExt`, `future::Future`
  --> utils/prometheus/src/lib.rs:17:20
   |
17 | use futures_util::{FutureExt, future::Future};
   |                    ^^^^^^^^^  ^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused imports: `Encoder`, `TextEncoder`
  --> utils/prometheus/src/lib.rs:29:18
   |
29 | use prometheus::{Encoder, TextEncoder, core::Collector};
   |                  ^^^^^^^  ^^^^^^^^^^^

warning: 2 warnings emitted

   Compiling rand_chacha v0.2.2
warning: unused imports: `FutureExt`, `future::Future`
  --> utils/prometheus/src/lib.rs:17:20
   |
17 | use futures_util::{FutureExt, future::Future};
   |                    ^^^^^^^^^  ^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused imports: `Encoder`, `TextEncoder`
  --> utils/prometheus/src/lib.rs:29:18
   |
29 | use prometheus::{Encoder, TextEncoder, core::Collector};
   |                  ^^^^^^^  ^^^^^^^^^^^

warning: 2 warnings emitted

warning: unused import: `std::io`
  --> client/rpc-servers/src/lib.rs:25:5
   |
25 | use std::io;
   |     ^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `log::error`
  --> client/rpc-servers/src/lib.rs:27:5
   |
27 | use log::error;
   |     ^^^^^^^^^^

warning: constant is never used: `MAX_PAYLOAD`
  --> client/rpc-servers/src/lib.rs:31:1
   |
31 | const MAX_PAYLOAD: usize = 15 * 1024 * 1024;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: constant is never used: `WS_MAX_CONNECTIONS`
  --> client/rpc-servers/src/lib.rs:34:1
   |
34 | const WS_MAX_CONNECTIONS: usize = 100;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: 4 warnings emitted

warning: unused import: `FrozenForDuration`
  --> client/db/src/light.rs:44:31
   |
44 | use crate::{DatabaseSettings, FrozenForDuration, DbHash};
   |                               ^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: 1 warning emitted

   Compiling pallet-staking v2.0.0 (/builds/frame/staking)
warning: unused variable: `enable_mdns`
   --> client/network/src/discovery.rs:169:4
    |
169 |             enable_mdns,
    |             ^^^^^^^^^^^ help: try ignoring the field: `enable_mdns: _`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: 1 warning emitted

   Compiling sc-service v0.8.0 (/builds/client/service)
warning: unused import: `io`
  --> client/service/src/config.rs:27:11
   |
27 | use std::{io, future::Future, path::{PathBuf, Path}, pin::Pin, net::SocketAddr, sync::Arc};
   |           ^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `io`
  --> client/service/src/lib.rs:37:11
   |
37 | use std::{io, pin::Pin};
   |           ^^

warning: unused import: `std::net::SocketAddr`
  --> client/service/src/lib.rs:38:5
   |
38 | use std::net::SocketAddr;
   |     ^^^^^^^^^^^^^^^^^^^^

warning: unused import: `parity_util_mem::MallocSizeOf`
  --> client/service/src/lib.rs:50:5
   |
50 | use parity_util_mem::MallocSizeOf;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: missing documentation for a trait
  --> client/service/src/lib.rs:91:1
   |
91 | pub trait MallocSizeOfWasm {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> client/service/src/lib.rs:22:9
   |
22 | #![warn(missing_docs)]
   |         ^^^^^^^^^^^^

warning: 5 warnings emitted

   Compiling node-rpc v2.0.0 (/builds/bin/node/rpc)
warning: type alias is never used: `FullClient`
  --> bin/node/cli/src/service.rs:39:1
   |
39 | type FullClient = sc_service::TFullClient<Block, RuntimeApi, Executor>;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: type alias is never used: `FullBackend`
  --> bin/node/cli/src/service.rs:40:1
   |
40 | type FullBackend = sc_service::TFullBackend<Block>;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: type alias is never used: `FullSelectChain`
  --> bin/node/cli/src/service.rs:41:1
   |
41 | type FullSelectChain = sc_consensus::LongestChain<FullBackend, Block>;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: type alias is never used: `FullGrandpaBlockImport`
  --> bin/node/cli/src/service.rs:42:1
   |
42 | / type FullGrandpaBlockImport =
43 | |     grandpa::GrandpaBlockImport<FullBackend, Block, FullClient, FullSelectChain>;
   | |_________________________________________________________________________________^

warning: function is never used: `new_partial`
  --> bin/node/cli/src/service.rs:46:8
   |
46 | pub fn new_partial(config: &Configuration) -> Result<sc_service::PartialComponents<
   |        ^^^^^^^^^^^

warning: struct is never constructed: `NewFullBase`
   --> bin/node/cli/src/service.rs:161:12
    |
161 | pub struct NewFullBase {
    |            ^^^^^^^^^^^

warning: function is never used: `new_full_base`
   --> bin/node/cli/src/service.rs:171:8
    |
171 | pub fn new_full_base(
    |        ^^^^^^^^^^^^^

warning: function is never used: `new_full`
   --> bin/node/cli/src/service.rs:338:8
    |
338 | pub fn new_full(config: Configuration)
    |        ^^^^^^^^

warning: function is never used: `new_light`
   --> bin/node/cli/src/service.rs:443:8
    |
443 | pub fn new_light(config: Configuration) -> Result<TaskManager, ServiceError> {
    |        ^^^^^^^^^

warning: 9 warnings emitted