perf: link with identical code folding

[Kha]

No description provided.

[Kha]

!bench

[leanprover-radar]

Benchmark results for 1a8b9c3 against 4af9cc0 are in! @Kha

Runs (2🟥)

• 🟥 build exited with code 2
• 🟥 other exited with code 2

[Kha]

!bench

[leanprover-radar]

Benchmark results for a4030bc against 4af9cc0 are in! @Kha

Medium changes (1✅)

• ✅ nat_repr//instructions: -552.6M (-12.2%)

[leanprover-community-bot]

Mathlib CI status (docs):

• ❗ Mathlib CI can not be attempted yet, as the nightly-testing-2026-01-16 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-mathlib, Mathlib CI should run now. You can force Mathlib CI using the force-mathlib-ci label. (2026-01-16 10:56:07)

[leanprover-bot]

Reference manual CI status:

• ❗ Reference manual CI can not be attempted yet, as the nightly-testing-2026-01-16 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-manual, reference manual CI should run now. You can force reference manual CI using the force-manual-ci label. (2026-01-16 10:56:09)