Add unconditional #[inline] to layout helper functions

[joshlf]

Motivation

• Recent changes added conditional inline(always) annotations behind zerocopy_inline_always; adding an unconditional #[inline] ensures a baseline inline hint is present regardless of that config.
• This keeps performance intent explicit for small layout helper functions across builds where the conditional flag is not enabled.

Description

• Add #[inline] to SizeInfo::try_to_nonzero_elem_size in zerocopy/src/layout.rs so it appears alongside #[cfg_attr(zerocopy_inline_always, inline(always))].
• Add #[inline] to padding_needed_for in zerocopy/src/util/mod.rs so it appears alongside #[cfg_attr(zerocopy_inline_always, inline(always))].
• Add #[inline] to max and min in zerocopy/src/util/mod.rs so each appears alongside #[cfg_attr(zerocopy_inline_always, inline(always))].
• No other logic or signatures were changed; only attribute annotations were added.

Testing

• Ran CARGO_ZEROCOPY_AUTO_INSTALL_TOOLCHAIN=1 ./cargo.sh +stable fmt --check and it completed successfully.
• Ran git diff --check and it reported no issues.

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Codex Task

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.85%. Comparing base (fbe9f18) to head (efbf239).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3483   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          20       20           
  Lines        6093     6093           
=======================================
  Hits         5597     5597           
  Misses        496      496           

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[joshlf]

@ojeda This has been published in 0.8.54.

[ojeda]

Thanks! That was quick.

Linked in our live list as usual. I can probably land this one this kernel cycle too, i.e. not just v0.8.52.