precompile methods marked ccallable (#42153)

Author: JeffBezanson

src/precompile.c

@@ -344,8 +344,8 @@ static int precompile_enq_specialization_(jl_method_instance_t *mi, void *closur
 static int precompile_enq_all_specializations__(jl_typemap_entry_t *def, void *closure)
 {
     jl_method_t *m = def->func.method;
-    if (m->name == jl_symbol("__init__") && jl_is_dispatch_tupletype(m->sig)) {
-        // ensure `__init__()` gets strongly-hinted, specialized, and compiled
+    if ((m->name == jl_symbol("__init__") || m->ccallable) && jl_is_dispatch_tupletype(m->sig)) {
+        // ensure `__init__()` and @ccallables get strongly-hinted, specialized, and compiled
         jl_method_instance_t *mi = jl_specializations_get_linfo(m, m->sig, jl_emptysvec);
         jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
     }