zend_alloc: Fix compile with ZEND_MM_STAT=0

Closes phpGH-18811.

Author: ndossche

NEWS

@@ -6,6 +6,7 @@ PHP                                                                        NEWS
   . Fixed GH-18695 (zend_ast_export() - float number is not preserved).
     (Oleg Efimov)
   . Do not delete main chunk in zend_gc. (danog, Arnaud)
+  . Fix compile issues with zend_alloc and some non-default options. (nielsdos)
 
 - Curl:
   . Fix memory leak when setting a list via curl_setopt fails. (nielsdos)

Zend/zend_alloc.c

@@ -2274,7 +2274,9 @@ void zend_mm_shutdown(zend_mm_heap *heap, bool full, bool silent)
 				/* Make sure the heap free below does not use tracked_free(). */
 				heap->custom_heap.std._free = free;
 			}
+#if ZEND_MM_STAT
 			heap->size = 0;
+#endif
 		}
 
 		if (full) {
@@ -2820,6 +2822,7 @@ static zend_always_inline zval *tracked_get_size_zv(zend_mm_heap *heap, void *pt
 }
 
 static zend_always_inline void tracked_check_limit(zend_mm_heap *heap, size_t add_size) {
+#if ZEND_MM_STAT
 	if (add_size > heap->limit - heap->size && !heap->overflow) {
 #if ZEND_DEBUG
 		zend_mm_safe_error(heap,
@@ -2831,6 +2834,7 @@ static zend_always_inline void tracked_check_limit(zend_mm_heap *heap, size_t ad
 			heap->limit, add_size);
 #endif
 	}
+#endif
 }
 
 static void *tracked_malloc(size_t size)
@@ -2844,7 +2848,9 @@ static void *tracked_malloc(size_t size)
 	}
 
 	tracked_add(heap, ptr, size);
+#if ZEND_MM_STAT
 	heap->size += size;
+#endif
 	return ptr;
 }
 
@@ -2855,7 +2861,9 @@ static void tracked_free(void *ptr) {
 
 	zend_mm_heap *heap = AG(mm_heap);
 	zval *size_zv = tracked_get_size_zv(heap, ptr);
+#if ZEND_MM_STAT
 	heap->size -= Z_LVAL_P(size_zv);
+#endif
 	zend_hash_del_bucket(heap->tracked_allocs, (Bucket *) size_zv);
 	free(ptr);
 }
@@ -2880,7 +2888,9 @@ static void *tracked_realloc(void *ptr, size_t new_size) {
 
 	ptr = __zend_realloc(ptr, new_size);
 	tracked_add(heap, ptr, new_size);
+#if ZEND_MM_STAT
 	heap->size += new_size - old_size;
+#endif
 	return ptr;
 }