[read-fonts] inline all the things

[dfrg]

Just adds a bunch of #[inline] attributes to codegen'd functions.

[behdad]

Haha. Nice one. Will measure soon.

[rsheeter]

LGTM assuming it helps. Would be nice to cite metrics for improvement

[behdad]

On Mac I don't see any change whatsoever. On Linux, I actually see 5% slowdown on the ligature-heavy BM_Shape/SourceSerifVariable-Roman.ttf/react-dom.txt/harfrust benchmark and 1% slowdown in other benches.

I'm okay merging, but looks like our config https://github.com/harfbuzz/harfbuzz/blob/main/src/rust/Cargo.toml already does a good job of inlining.

Perhaps the config should be documented in the HR repo itself, or enabled there by default.

[behdad]

On Linux, I actually see 5% slowdown on the ligature-heavy BM_Shape/SourceSerifVariable-Roman.ttf/react-dom.txt/harfrust benchmark and 1% slowdown in other benches.

I rebuilt with release mode, which means codegen-units 1 instead of 16, and I see no perf diff whatsoever. So, LGTM.