Ok, maybe Nikita is right. We should default this on.

Author: rlerdorf

Zend/tests/bug63734.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #63734 (Garbage collector can free zvals that are still referenced)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 class C {

Zend/tests/bug69446.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #69446 (GC leak relating to removal of nested data after dtors run)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 $bar = NULL;

Zend/tests/bug69446_2.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #69446 (GC leak relating to removal of nested data after dtors run)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 $bar = NULL;

Zend/tests/bug69534.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #69534 (Cycle leaks through declared properties on internal classes)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 class Node extends SplObjectStorage {

Zend/tests/bug70805_1.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #70805 (Segmentation faults whilst running Drupal 8 test suite) (Crash)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 class A {

Zend/tests/bug70805_2.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #70805 (Segmentation faults whilst running Drupal 8 test suite) (Memleak)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 class A {

Zend/tests/bug71818.phpt

@@ -1,5 +1,7 @@
 --TEST--
 Bug #71818 (Memory leak when array altered in destructor)
+--INI--
+zend.enable_gc = 1
 --FILE--
 <?php
 class MemoryLeak