remove old cruft from jl_set_typeinf_func (#57760)

This has not actually been relevant since solving #265, so all it has
been doing since then is making the build slightly slower, bigger, and
less correct.

Author: vtjnash

src/gf.c

@@ -759,33 +759,6 @@ JL_DLLEXPORT int jl_mi_try_insert(jl_method_instance_t *mi JL_ROOTING_ARGUMENT,
     return ret;
 }
 
-static int get_method_unspec_list(jl_typemap_entry_t *def, void *closure)
-{
-    size_t world = jl_atomic_load_acquire(&jl_world_counter);
-    jl_value_t *specializations = jl_atomic_load_relaxed(&def->func.method->specializations);
-    if (specializations == (jl_value_t*)jl_emptysvec)
-        return 1;
-    if (!jl_is_svec(specializations)) {
-        jl_method_instance_t *mi = (jl_method_instance_t*)specializations;
-        assert(jl_is_method_instance(mi));
-        if (jl_rettype_inferred_native(mi, world, world) == jl_nothing)
-            jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
-        return 1;
-    }
-    size_t i, l = jl_svec_len(specializations);
-    JL_GC_PUSH1(&specializations);
-    for (i = 0; i < l; i++) {
-        jl_method_instance_t *mi = (jl_method_instance_t*)jl_svecref(specializations, i);
-        if ((jl_value_t*)mi != jl_nothing) {
-            assert(jl_is_method_instance(mi));
-            if (jl_rettype_inferred_native(mi, world, world) == jl_nothing)
-                jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
-        }
-    }
-    JL_GC_POP();
-    return 1;
-}
-
 int foreach_mtable_in_module(
         jl_module_t *m,
         int (*visit)(jl_methtable_t *mt, void *env),
@@ -865,42 +838,14 @@ int jl_foreach_reachable_mtable(int (*visit)(jl_methtable_t *mt, void *env), voi
     return 1;
 }
 
-static int reset_mt_caches(jl_methtable_t *mt, void *env)
-{
-    // removes all method caches
-    // this might not be entirely safe (GC or MT), thus we only do it very early in bootstrapping
-    if (!mt->frozen) { // make sure not to reset builtin functions
-        jl_atomic_store_release(&mt->leafcache, (jl_genericmemory_t*)jl_an_empty_memory_any);
-        jl_atomic_store_release(&mt->cache, jl_nothing);
-    }
-    jl_typemap_visitor(jl_atomic_load_relaxed(&mt->defs), get_method_unspec_list, env);
-    return 1;
-}
-
 
 jl_function_t *jl_typeinf_func JL_GLOBALLY_ROOTED = NULL;
 JL_DLLEXPORT size_t jl_typeinf_world = 1;
 
 JL_DLLEXPORT void jl_set_typeinf_func(jl_value_t *f)
 {
-    size_t newfunc = jl_typeinf_world == 1 && jl_typeinf_func == NULL;
     jl_typeinf_func = (jl_function_t*)f;
     jl_typeinf_world = jl_get_tls_world_age();
-    int world = jl_atomic_fetch_add(&jl_world_counter, 1) + 1; // make type-inference the only thing in this world
-    if (newfunc) {
-        // give type inference a chance to see all of these
-        // TODO: also reinfer if max_world != ~(size_t)0
-        jl_array_t *unspec = jl_alloc_vec_any(0);
-        JL_GC_PUSH1(&unspec);
-        jl_foreach_reachable_mtable(reset_mt_caches, (void*)unspec);
-        size_t i, l;
-        for (i = 0, l = jl_array_nrows(unspec); i < l; i++) {
-            jl_method_instance_t *mi = (jl_method_instance_t*)jl_array_ptr_ref(unspec, i);
-            if (jl_rettype_inferred_native(mi, world, world) == jl_nothing)
-                jl_type_infer(mi, world, SOURCE_MODE_NOT_REQUIRED);
-        }
-        JL_GC_POP();
-    }
 }
 
 static int very_general_type(jl_value_t *t)