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PR rtl-optimization/32300 * see.c (see_copy_insn): New function. (see_def_extension_not_merged, see_merge_one_use_extension, see_merge_one_def_extension): Use it. Avoid changing PREV_INSN/NEXT_INSN chains directly, insted emit insns into sequences. Call df_insn_delete on temporary insns that won't be emitted into the insn stream. (rest_of_handle_see): Turn off DF_DEFER_INSN_RESCAN and run df_process_deferred_rescans () before run_fast_dce. From-SVN: r128108
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