WIP: Report tier-promoted (PGO) opt-level per CodeInstance#42
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WIP: Report tier-promoted (PGO) opt-level per CodeInstance#42IanButterworth wants to merge 1 commit into
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Surface the TIER_OPTIMIZED bit that Julia's tiered runtime sets on CodeInstances promoted from baseline (-O0) to optimized (-O2) during precompile-time execution. The bit is preserved through pkgimage serialization (Julia 1.14+) and serves as PGO signal: which methods were hot while the precompile workload ran in the child Julia process. - New `tier_optimized(ci)` predicate reading `ci.flags & 0x20`. - Summary line in `show` reports counts and percentage of promoted CIs. - Verbose mode prefixes each specialization with `[O2]` (bold yellow) or `[O0]`, with promoted entries sorted first within each module. The two verbose listings (internal and new external specializations) now share a `_show_grouped_specializations` helper. Co-authored-by: GitHub Copilot <noreply@github.com>
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