This reverts the relevant bits from #21746 so that style and dependencies can
build with stable.
This is important because:
* `selectors` is a published crate.
* Gecko compiles with stable (more or less).
I reviewed that PR under the assumption that the union feature was stable, since
untagged unions are stable since 1.19, but turns out that smallvec uses non-Copy
types in unions, which are still unstable.
This leaves the union feature used on Servo, so that it gets testing, taking
advantage of features being additive.
This cherry-picks servo/servo#21788.
We had a mix of 0.6.2 and 0.6.5 (which is the current release),
this unifies to the latest version. It also enables the union
feature which removes the discriminant, reducing memory usage.
This cherry-picks servo/servo#21746.
* adds a hashglobe::alloc::realloc, as that was previously not implemented,
copying and simplifying from liballoc_system.
* routes malloc and realloc calls through hashglobe::alloc::, instead of
doing it via direct 'extern "C"' calls.
* removes the #[cfg(feature = "known_system_malloc")] markings in
fallible/lib.rs (the fallible vec stuff) on the assumption that we no
longer need to special-case these uses.
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…on on stylist rebuilds. r=emilio.
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…acilities. r=emilio@crisal.io.
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…r=manishearth.
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--HG--
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