Initialize more fields of seginfo

original commit: 48e93161f6ac2796d17a0f147f0dca1e1e195684

LOG

@@ -1025,3 +1025,4 @@
   where the cp register copy in the thread context could be changed
   in the callable prep before S_call_help gets it
     cpnanopass.ss, x86_64.ss, x86.ss, foreign2.c, foreign.ms
+- initialize all fields of seginfo to avoid undefined values

c/segment.c

@@ -228,7 +228,9 @@ static void initialize_seginfo(seginfo *si, ISPC s, IGEN g) {
 
   si->space = s;
   si->generation = g;
+  si->sorted = 0;
   si->min_dirty_byte = 0xff;
+  si->trigger_ephemerons = NULL;
   for (d = 0; d < cards_per_segment; d += sizeof(ptr)) {
     iptr *dp = (iptr *)(si->dirty_bytes + d);
     /* fill sizeof(iptr) bytes at a time with 0xff */