feat: implement mb_strlen() builtin (UTF-8 code-point count)#466
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feat: implement mb_strlen() builtin (UTF-8 code-point count)#466chadmandoo wants to merge 2 commits into
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Cherry-picked our illegalstudio#466 mb_strlen (UTF-8 code-point count) + fixed the codegen_ir→codegen module rename for the EIR refactor. (Skipped the native callable-dispatch-exclusion commit — callable_dispatch.rs was restructured; not needed for the --check survey; follow-up for native codegen.) Survey 72→73%.
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Implements
mb_strlen()via the builtin registry with a UTF-8 code-point-counting runtime helper (continuation bytes don't count). Second commit excludes it from the runtime callable-wrapper dispatch table — it is registry/EIR-only with no frozen legacy-backend emitter, so a deferred-closure wrapper would emit an unresolved_fn_mb_u_strlenreference (same rationale as the serialize/unserialize exclusions). Byte-parity vs PHP 8.5 (ASCII / multibyte / empty / CJK) + regression test.