* dll_init.cc (reserve_upto): Remove.

(release_upto): Ditto.
(dll_list::reserve_space): New function to reserve space needed by DLL_LOAD
dlls early in the fork process.
(dll_list::load_after_fork): Rewrite to use recursion for tracking reservations
made while trying to make dlls land where they belong.
(dll_list::load_after_fork_impl): Ditto.
(dll_list::alloc): Initialize image base field.
* dll_init.h (struct dll_list): declare new functions.
(dll::image_size): New member.

winsup/cygwin/dll_init.h

@@ -52,6 +52,7 @@ struct dll
   int count;
   bool has_dtors;
   dll_type type;
+  DWORD image_size;
   long ndeps;
   dll** deps;
   PWCHAR modname;