Auto merge of #114115 - nnethercote:less-token-tree-cloning, r=petrochenkov

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Less `TokenTree` cloning

`TokenTreeCursor` has this comment on it:
```
// FIXME: Many uses of this can be replaced with by-reference iterator to avoid clones.
```
This PR completes that FIXME. It doesn't have much perf effect, but at least we now know that.

r? `@petrochenkov`

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bors 2023-07-28 01:21:27 +00:00

parent f561e70c09 a7d64006eb

commit 57291e2d4c

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