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* var-tracking.c (unshare_variable): Force initialized to be VAR_INIT_STATUS_INITIALIZED unless flag_var_tracking_uninit. (set_variable_part): Likewise. (struct variable_union_info): Remove pos_src field. (vui_vec, vui_allocated): New variables. (variable_union): Pass VAR_INIT_STATUS_UNKNOWN to unshare_variable unconditionally. Avoid XCVECNEW/free for every sorting, for dst_l == 1 use a simpler sorting algorithm. Compute pos field right away, don't fill in pos_src. For dst_l == 2 avoid qsort. Avoid quadratic comparison if !flag_var_tracking_uninit. (variable_canonicalize): Pass VAR_INIT_STATUS_UNKNOWN to unshare_variable unconditionally. (dataflow_set_different_2): Removed. (dataflow_set_different): Don't traverse second hash table. (compute_bb_dataflow): Pass VAR_INIT_STATUS_UNINITIALIZED unconditionally to var_reg_set or var_mem_set. (emit_notes_in_bb): Likewise. (delete_variable_part): Pass VAR_INIT_STATUS_UNKNOWN to unshare_variable. (emit_note_insn_var_location): Don't set initialized to VAR_INIT_STATUS_INITIALIZED early. (vt_finalize): Free vui_vec if needed, clear vui_vec and vui_allocated. * rtl.c (rtx_equal_p): Don't implement on top of rtx_equal_p_cb. From-SVN: r148852
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