Leak in i386_elf_section_change_hook

notes_alloc is perfect for assorted memory you can't free easily
and/or would rather leave freeing until just before exit.

	* config/tc-i386.c (i386_elf_section_change_hook): Use notes_alloc.

gas/config/tc-i386.c

diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index ed7c4a5..c56ca4a 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -17627,7 +17627,7 @@
       break;
   if (!curr)
     {
-      curr = XNEW (struct i386_segment_info);
+      curr = notes_alloc (sizeof (*curr));
       curr->subseg = info->subseg;
       curr->next = NULL;
       prev->next = curr;