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* 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
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