chore: release v2.2.2

[github-actions]

🤖 New release

• rusty_alloc: 2.2.1 -> 2.2.2 (✓ API compatible changes)
• rusty_alloc-api: 2.2.1 -> 2.2.2

Changelog

rusty_alloc

2.2.2 - 2026-10-01

Fixed

• (prim) macOS range_is_reserved via mach_vm_region, not mincore
• (blockmap) clear a reused slot's map pointer -- stress_mt aborted on 4 CPUs
• (prim) build on macOS -- mincore's out-vector type differs on Apple

Other

• (unsafe) record the two macOS range_is_reserved sites; ratchet 963 -> 965

rusty_alloc-api

2.2.1 - 2026-09-25

Performance

• GlobalAlloc methods are #[inline], as the mimalloc crate's are, so
  rustc's __rust_alloc / __rust_dealloc shims carry the fast path instead
  of jumping to it, and dealloc is the free fast path with its null test
  folded away. Measured whole-program against 2.2.0 on two deterministic Rust
  workloads (bench/rust-globalalloc.sh): -21.1 % and -5.8 %.
• Layouts aligned up to two words (16 bytes on 64-bit) come from the natural
  size classes, which are already aligned that far, instead of the aligned
  path; every hashbrown table is such a layout. tests/natural_align.rs pins
  the alignment for every size class through alloc, alloc_zeroed and realloc.
• realloc keeps a block in place at any alignment when it fits instead
  of always allocating, copying and freeing above 8 bytes of alignment:
  -27.3 % on an over-aligned buffer workload.

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