ruby-core

> I am going to move more data into rb_mjit_unit struct for state
> management using callbacks and events.  It looks like
> rb_mjit_unit_node is useless so I will get rid of it and
> embed ccan/list node into rb_mjit_unit.
> 
> compact_units list is useless and you have no plans for it right?

I'm testing this patch for ccan/list in rb_mjit_unit:

   https://80x24.org/spew/20181030030441.10036-1-e@80x24.org/raw

Howeever, I think I found an old bug.  Accessing
unit->iseq->body outside of critical section seems wrong and
I hit a segfault:

```
    CRITICAL_SECTION_FINISH(3, "before mjit_compile to wait GC finish");

    {
        VALUE s = rb_iseq_path(unit->iseq);
        const char *label = RSTRING_PTR(unit->iseq->body->location.label);
        const char *path = RSTRING_PTR(s);
        int lineno = FIX2INT(unit->iseq->body->location.first_lineno);
        verbose(2, "start compilation: %s@%s:%d -> %s", label, path, lineno, c_file);
        fprintf(f, "/* %s@%s:%d */\n\n", label, path, lineno);
    }
    success = mjit_compile(f, unit->iseq->body, funcname, cc_entries, is_entries);

    /* release blocking mjit_gc_start_hook */
    CRITICAL_SECTION_START(3, "after mjit_compile to wakeup client for GC");
```

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