Extract GC_BENCH into zend_gc.h

This constant is used in zend.c

Author: Girgias

Zend/zend_gc.c

@@ -69,10 +69,6 @@
 #include "zend.h"
 #include "zend_API.h"
 
-#ifndef GC_BENCH
-# define GC_BENCH 0
-#endif
-
 #ifndef ZEND_GC_DEBUG
 # define ZEND_GC_DEBUG 0
 #endif

Zend/zend_gc.h

@@ -22,6 +22,10 @@
 
 BEGIN_EXTERN_C()
 
+#ifndef GC_BENCH
+# define GC_BENCH 0
+#endif
+
 typedef struct _zend_gc_status {
 	uint32_t runs;
 	uint32_t collected;