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Rollup merge of rust-lang#50564 - nnethercote:inline-Span-methods, r=petrochenkov
Inline `Span` methods.
Because they are simple and hot.
This change speeds up some incremental runs of a few rustc-perf
benchmarks, the best by 3%.
Here are the ones with a speedup of at least 1%:
```
coercions
avg: -1.1% min: -3.4% max: -0.2%
html5ever-opt
avg: -0.8% min: -1.7% max: -0.2%
clap-rs-check
avg: -0.3% min: -1.4% max: 0.7%
html5ever
avg: -0.7% min: -1.2% max: -0.4%
html5ever-check
avg: -0.9% min: -1.1% max: -0.8%
clap-rs
avg: -0.4% min: -1.1% max: -0.1%
crates.io-check
avg: -0.8% min: -1.0% max: -0.6%
serde-opt
avg: -0.6% min: -1.0% max: -0.3%
```
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