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RawVec: don't recompute capacity after allocating. by nnethercote · Pull Request...
source link: https://github.com/rust-lang/rust/pull/92220
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Currently it sets the capacity to ptr.len() / mem::size_of::<T>()
after any buffer allocation/reallocation. This would be useful if
allocators ever returned a NonNull<[u8]> with a size larger than
requested. But this never happens, so it's not useful.
Removing this slightly reduces the size of generated LLVM IR, and
slightly speeds up the hot path of RawVec growth.
r? @ghost
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