re PR middle-end/92153 (ICE / segmentation fault, use-after-free at gcc/ggc-page.c:1159)

	PR middle-end/92153
	* ggc-page.c (release_pages): Read g->alloc_size before free rather
	than after it.

From-SVN: r277157

gcc/ChangeLog

+2019-10-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/92153
+	* ggc-page.c (release_pages): Read g->alloc_size before free rather
+	than after it.
+
 2019-10-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
 	* config/arm/t-multilib: Add rule to regenerate mutlilib header file

gcc/ggc-page.c

@@ -1155,8 +1155,8 @@ release_pages (void)
       {
 	*gp = g->next;
 	G.bytes_mapped -= g->alloc_size;
-	free (g->allocation);
 	n1 += g->alloc_size;
+	free (g->allocation);
       }
     else
       gp = &g->next;