Eagerly name modules and classes

* variable.c: make the hidden ivars `classpath` and `tmp_classpath` the source
  of truth for module and constant names. Assign to them when modules are bind
  to constants.

* variable.c: remove references to module name cache, as what used to be the cache
  is now the source of truth. Remove rb_class_path_no_cache().

* variable.c: remove the hidden ivar `classid`. This existed for the purposes of
  module name search, which is now replaced. Also, remove the associated
  rb_name_class().

* class.c: use rb_set_class_path_string to set the name of Object during boot.
  Must use a fstring as this runs before rb_cString is initialized and
  creating a normal string leads to a VALUE without a class.

* spec/ruby/core/module/name_spec.rb: add a few specs to specify what happens
  to Module#name across multiple operations. These specs pass without other
  code changes in this commit.

[Feature #15765]

1 files changed, 3 insertions, 3 deletions

diff --git a/gc.c b/gc.c
index 394fd277e2..6df81b959c 100644
--- a/gc.c
+++ b/gc.c
@@ -11097,7 +11097,7 @@ rb_raw_obj_info(char *buff, const int buff_size, VALUE obj)
 	}
 	else {
             if (RTEST(RBASIC(obj)->klass)) {
-	    VALUE class_path = rb_class_path_cached(RBASIC(obj)->klass);
+	    VALUE class_path = rb_class_path(RBASIC(obj)->klass);
 	    if (!NIL_P(class_path)) {
                 APPENDF((BUFF_ARGS, "(%s)", RSTRING_PTR(class_path)));
 	    }
@@ -11151,7 +11151,7 @@ rb_raw_obj_info(char *buff, const int buff_size, VALUE obj)
           case T_CLASS:
           case T_MODULE:
             {
-                VALUE class_path = rb_class_path_cached(obj);
+                VALUE class_path = rb_class_path(obj);
                 if (!NIL_P(class_path)) {
                     APPENDF((BUFF_ARGS, "%s", RSTRING_PTR(class_path)));
                 }
@@ -11159,7 +11159,7 @@ rb_raw_obj_info(char *buff, const int buff_size, VALUE obj)
             }
           case T_ICLASS:
             {
-                VALUE class_path = rb_class_path_cached(RBASIC_CLASS(obj));
+                VALUE class_path = rb_class_path(RBASIC_CLASS(obj));
                 if (!NIL_P(class_path)) {
                     APPENDF((BUFF_ARGS, "src:%s", RSTRING_PTR(class_path)));
                 }