Rollup merge of #131783 - practicalrs:fix_explicit_iter_loop, r=compiler-errors

Fix explicit_iter_loop in rustc_serialize

Hi,

This PR fixes some clippy warnings

```
warning: it is more concise to loop over references to containers instead of using explicit iteration methods
   --> compiler/rustc_serialize/src/serialize.rs:675:18
    |
675 |         for e in self.iter() {
    |                  ^^^^^^^^^^^ help: to write this more concisely, try: `self`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_iter_loop

```

Best regards,
Michal

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