bors 88b3b520e8 Auto merge of #141086 - a1phyr:spec_advance_by, r=jhpratt
Implement `advance_by` via `try_fold` for `Sized` iterators

When `try_fold` is overriden, it is usually easier for compilers to optimize.

Example difference: https://iter.godbolt.org/z/z8cEfnKro
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