passes.c (pass_init_dump_file): Only open a clean graph dump file if the dump was not already initialized.

	* passes.c (pass_init_dump_file): Only open a clean graph dump file if
	the dump was not already initialized.

	Revert:
	2012-12-03  Steven Bosscher  <steven@gcc.gnu.org>
	* passes.c (finish_optimization_passes): Don't finish graph dumps here.
	(pass_fini_dump_file): Wrap in TV_DUMP.  Finish graph dumps.
	(execute_one_pass): Don't set up graph dumps here.

From-SVN: r194186