Rollup merge of #131359 - practicalrs:fix_used_underscore_binding, r=jieyouxu

Fix used_underscore_binding in rustc_serialize

Hi,

This PR fixes the following clippy warnings in rustc_serialize

```
warning: used underscore-prefixed binding
   --> compiler/rustc_serialize/src/opaque.rs:443:27
    |
443 |         debug_assert_eq!((_end_pos - _start_pos), IntEncodedWithFixedSize::ENCODED_SIZE);
    |                           ^^^^^^^^
    |
note: binding is defined here
   --> compiler/rustc_serialize/src/opaque.rs:442:13
    |
442 |         let _end_pos = e.position();
    |             ^^^^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding
    = note: requested on the command line with `-W clippy::used-underscore-binding`

warning: used underscore-prefixed binding
   --> compiler/rustc_serialize/src/opaque.rs:443:38
    |
443 |         debug_assert_eq!((_end_pos - _start_pos), IntEncodedWithFixedSize::ENCODED_SIZE);
    |                                      ^^^^^^^^^^
    |
note: binding is defined here
   --> compiler/rustc_serialize/src/opaque.rs:440:13
    |
440 |         let _start_pos = e.position();
    |             ^^^^^^^^^^
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding
```

Best regards,
Michal

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