Ruby

ZJIT: Fix rebase issue with tests

ZJIT: Inline attr_accessor/attr_writer to SetIvar (#14629)

ZJIT: Count dynamic instance variable lookups (#14615)

ZJIT: Add stats for cfuncs that are not optimized (#14638)

• ZJIT: Add stats for cfuncs that are not optimized

• ZJIT: Add IncrCounterPtr HIR instead

From lobsters

Top-20 Unoptimized C functions (73.0% of total 15,276,688):
 Kernel#is_a?: 2,052,363 (13.4%)...

ZJIT: Remove RefCell from IseqCall

No point taking the panic risks with RefCell when most fields in it are
already in a Cell. Put iseq in a Cell and we no longer need the
wrapping. Saves memory, too.

ZJIT: Incorporate parameter loads into HIR (#14659)

Bump actions/cache in /.github/actions/setup/directories

Bumps actions/cache from 4.2.4 to 4.3.0.

• Release notes
• Changelog...

Bump actions/cache from 4.2.4 to 4.3.0

Bumps actions/cache from 4.2.4 to 4.3.0.

• Release notes
• Changelog
• Commits...

[DOC] Mark Namespace debug methods to be "nodoc"

These methods are debug methods and no RDoc is provided.
Mark these methods as "nodoc" to fix "Miscellaneous checks"
CI job.

Failed CI job: https://github.com/ruby/ruby/actions/runs/18081591948/job/51445635741

[DOC] Tweaks for String#prepend