allchblk.c (GC_allochblk_nth): Dont overlook available space if GC disabled...

	* allchblk.c (GC_allochblk_nth): Dont overlook available space if
	  GC disabled, correctly convert GC_finalizer_mem_freed to byte,
  	  total_size to words.
  	* dyn_load.c (win32 GC_register_dynamic_libraries): Consider only
	  MEM_IMAGE regions.
  	* mach_dep.c (GC_with_callee_saves_pushed): separate into new function,
	  and indent appropriately.
  	* mark_rts.c (GC_approx_sp): Access stack.
	* pthread_stop_world.c: (GC_suspend_handler): Explicitly push
	  callee-saves registers when appropriate.
  	  (GC_stop_world): Handle EINTR from sem_wait (sync with Mono GC).

From-SVN: r94776