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.

lib/timevar.def

@@ -0,0 +1,56 @@
+/* This file contains the definitions for timing variables used to -*- C -*-
+   measure run-time performance of the compiler.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Alex Samuel <samuel@codesourcery.com>
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to
+   the Free Software Foundation, 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* This file contains timing variable definitions, used by timevar.h
+   and timevar.c.
+
+   Syntax:
+
+     DEFTIMEVAR (id, name)
+
+   where ID is the enumeral value used to identify the timing
+   variable, and NAME is a character string describing its purpose.  */
+
+/* The total execution time.  */
+DEFTIMEVAR (TV_TOTAL                 , "total time")
+
+/* Time spent in the reader.  */
+DEFTIMEVAR (TV_READER                , "reader")
+DEFTIMEVAR (TV_SCANNING              , "scanner")
+DEFTIMEVAR (TV_PARSING               , "parser")
+
+/* Time spent handling the grammar.  */
+DEFTIMEVAR (TV_REDUCE                , "reducing the grammar")
+DEFTIMEVAR (TV_SETS                  , "computing the sets")
+DEFTIMEVAR (TV_LR0                   , "LR(0)")
+DEFTIMEVAR (TV_LALR                  , "LALR(1)")
+DEFTIMEVAR (TV_CONFLICTS             , "conflicts")
+
+/* Time spent outputing results.  */
+DEFTIMEVAR (TV_REPORT                , "outputing report")
+DEFTIMEVAR (TV_GRAPH                 , "outputing graph")
+DEFTIMEVAR (TV_ACTIONS               , "parser action tables")
+DEFTIMEVAR (TV_PARSER                , "outputing parser")
+DEFTIMEVAR (TV_M4                    , "running m4")
+
+/* Time spent by freeing the memory :).  */
+DEFTIMEVAR (TV_FREE                  , "freeing")