Fix crashes in function registration + test

Internal function won't need their refcount increased as they outlive
the debugger session, and userland functions won't be unloaded either.
So no refcount management is necessary for registered functions.

NEWS

@@ -16,6 +16,9 @@ PHP                                                                        NEWS
 - Intl:
   . Fixed bug GH-11874 (intl causing segfault in docker images). (nielsdos)
 
+- PHPDBG:
+  . Fix crashes in function registration + test. (nielsdos, Girgias)
+
 - SNMP:
   . Fixed bug GH-17330 (SNMP::setSecurity segfault on closed session).
     (David Carlier)

sapi/phpdbg/phpdbg.c

@@ -89,11 +89,6 @@ static void php_phpdbg_destroy_bp_condition(zval *data) /* {{{ */
 	efree(brake);
 } /* }}} */
 
-static void php_phpdbg_destroy_registered(zval *data) /* {{{ */
-{
-	zend_function_dtor(data);
-} /* }}} */
-
 static void php_phpdbg_destroy_file_source(zval *data) /* {{{ */
 {
 	phpdbg_file_source *source = (phpdbg_file_source *) Z_PTR_P(data);
@@ -163,7 +158,7 @@ static PHP_MINIT_FUNCTION(phpdbg) /* {{{ */
 	zend_hash_init(&PHPDBG_G(bp)[PHPDBG_BREAK_MAP], 8, NULL, NULL, 0);
 
 	zend_hash_init(&PHPDBG_G(seek), 8, NULL, NULL, 0);
-	zend_hash_init(&PHPDBG_G(registered), 8, NULL, php_phpdbg_destroy_registered, 0);
+	zend_hash_init(&PHPDBG_G(registered), 8, NULL, NULL, true);
 
 	zend_hash_init(&PHPDBG_G(file_sources), 0, NULL, php_phpdbg_destroy_file_source, 0);
 	phpdbg_setup_watchpoints();

sapi/phpdbg/phpdbg_prompt.c

@@ -1424,7 +1424,6 @@ PHPDBG_COMMAND(register) /* {{{ */
 	if (!zend_hash_str_exists(&PHPDBG_G(registered), lcname, lcname_len)) {
 		if ((function = zend_hash_str_find_ptr(EG(function_table), lcname, lcname_len))) {
 			zend_hash_str_update_ptr(&PHPDBG_G(registered), lcname, lcname_len, function);
-			function_add_ref(function);
 
 			phpdbg_notice("Registered %s", lcname);
 		} else {

sapi/phpdbg/tests/register_function.phpt

@@ -0,0 +1,30 @@
+--TEST--
+Test registering of functions
+--PHPDBG--
+R testfunc
+testfunc 1 2 3
+R var_dump
+var_dump foo
+q
+--FILE--
+<?php
+function testfunc() {
+    var_dump(func_get_args());
+}
+?>
+--EXPECTF--
+[Successful compilation of %s]
+prompt> [Registered testfunc]
+prompt> array(3) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+  [2]=>
+  int(3)
+}
+
+prompt> [Registered var_dump]
+prompt> string(3) "foo"
+
+prompt>