[mono][interp] Add missing GC wbarriers for static field stores in collectible assemblies

Author: BrzVlad

src/mono/mono/mini/interp/transform.c

@@ -4644,7 +4644,12 @@ interp_emit_sfld_access (TransformData *td, MonoClassField *field, MonoClass *fi
 			}
 			interp_ins_set_dreg (td->last_ins, td->sp [-1].var);
 		} else {
-			if (G_UNLIKELY (m_field_is_from_update (field)) && (mt == MINT_TYPE_VT || mt == MINT_TYPE_O)) {
+			// Fields from hotreload update and fields from collectible assemblies are not
+			// stored inside fixed gc roots but rather in other objects. This means that
+			// storing into these fields requires write barriers.
+			if ((mt == MINT_TYPE_VT || mt == MINT_TYPE_O) &&
+					(m_field_is_from_update (field) ||
+					mono_image_get_alc (m_class_get_image (m_field_get_parent (field)))->collectible)) {
 				interp_emit_ldsflda (td, field, error);
 				return_if_nok (error);
 				interp_emit_stobj (td, field_class, TRUE);