* cygheap.h (cygheap_debug::endh): Delete.

* debug.cc (lock_debug::acquired): Delete.
(lock_debug::lock_debug): Simplify.
(lock_debug::unlock): Ditto.
(find_handle): Don't set endh here.
(add_handle): Add new handle to beginning of the list rather than trying to
maintain an end list pointer.
(delete_handle): Minor optimization.
(mark_closed): Make logic clearer.
(verify_handle): Lock handle list before scanning.
(setclexec): Ditto.
(modify_handle): Ditto.
(newh): Don't lock handle list here.  Assume caller did this.
(mark_closed): Ditto.
(close_handle): Remove unneeded #if.
* dtable.cc (dtable::dup2): Tweak debug output.

winsup/cygwin/cygheap.h

@@ -230,7 +230,6 @@ public:
 struct cygheap_debug
 {
   handle_list starth;
-  handle_list *endh;
   handle_list freeh[500];
 };
 #endif