Unmark marked blocks after code GC

TODO.FACTOR.txt

@@ -1,10 +1,3 @@
-+ 0.85:
-
-- signal 4 on datastack underflow on mac intel??
-- test alien-indirect
-- code GC:
-  - minor GC takes too long now, card mark
-
 + ui:
 
 - the editor should fill up the interior of the scroller completely
@@ -109,6 +102,9 @@
 
 + misc:
 
+- signal 4 on datastack underflow on mac intel??
+- fix alien-callback/SEH bug on win32
+- minor GC takes too long now, we should card mark code heap
 - fix this:
   [ 1 2 3 4 5 6 7 8 9 10 10 10 10 10 10 10 10 10 10 11 11 11 113 ] .
 [ 1 2 3 4 5 6 7 8 9 10 10 10 10 10 10 10 10 10 10 11 11 11 113 

vm/code_gc.c

@@ -133,6 +133,8 @@ void free_unmarked(HEAP *heap)
 				prev = scan;
 			}
 		}
+		else if(scan->status == B_MARKED)
+			scan->status = B_ALLOCATED;
 
 		scan = next_block(heap,scan);
 	}