test(allocator): fix test on 32 bit platforms

[overlookmotel]

#20963 had a test failing on 32-bit platforms. Fix it.

[overlookmotel]

• test(allocator): fix test on 32 bit platforms #20977 👈 (View in Graphite)
• main

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[Copilot]

Pull request overview

Fixes an allocator unit test that was failing on 32-bit targets by making the ChunkFooter size assertion architecture-aware, aligning the test with the actual ChunkFooter layout/padding on different pointer widths.

Changes:

• Split ChunkFooter size assertion into two #[cfg(target_pointer_width = "...")] tests.
• Updated test names to reflect the expected word counts on 64-bit vs 32-bit platforms.

[codspeed-hq]

Merging this PR will not alter performance

✅ 48 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing om/04-02-test_allocator_fix_test_on_32_bit_platforms (35367a0) with main (c1a48f0)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩