* dce.c (init_dce): Only initialize the obstacks for the fast pass.
	(fini_dce): Only release them for the fast pass.
	(end_ud_dce): Delete.
	(rest_of_handle_ud_dce): Do not modify df_in_progress.
	Call fini_dce instead of end_ud_dce.
	(rest_of_handle_fast_dce): Do not modify df_in_progress.
	(run_fast_df_dce): Reset df_in_progress to false on exit.

From-SVN: r129384