Steal GCC's --time-report support.

* lib/timevar.c, lib/timevar.h, lib/timevar.def: New,
stolen/adjusted from GCC.
* m4/stage.m4: Remove time related checks.
* m4/timevar.m4: New.
* configure.in: Adjust.
* src/system.h: Adjust to using timevar.h.
* src/getargs.h, src/getargs.c: Support trace_time for
--trace=time.
* src/main.c (stage): Remove.
(main): Replace `stage' invocations with timevar calls.
* src/output.c: Insert pertinent timevar calls.

src/getargs.h

@@ -45,6 +45,7 @@ enum trace_e
     trace_tools     = 1 << 3,
     trace_automaton = 1 << 4,
     trace_grammar   = 1 << 5,
+    trace_time      = 1 << 6,
     trace_all       = ~0
   };
 extern int trace_flag;