Auto merge of #7677 - surechen:edit_large_enum_variant, r=camsteffen

fix bug for large_enum_variants

Fix the discussion problem in the issue of https://github.com/rust-lang/rust-clippy/issues/7666#issuecomment-919654291

About the false positive problem of case:
```rust
enum LargeEnum6 {
    A,
    B([u8;255]),
    C([u8;200]),
}
```

changelog: Fix largest_enum_variant wrongly identifying the second largest variant.