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* var-tracking.c (enum micro_operation_type): Add MO_COPY. (var_debug_decl): New function. (var_reg_set): Follow debug decl link. Add location even if reg is already known to hold some other variable. (var_mem_set): Follow debug decl link. (var_reg_delete_and_set, var_mem_delete_and_set): Follow debug decl link. Delete other known locations of the variable part if requested. (var_reg_delete, var_mem_delete): Delete other known locations of the variable part if requested. (same_variable_part_p): New function. (add_stores): Select MO_COPY when appropriate. (vt_initialize): Handle it. (compute_bb_dataflow, emit_notes_in_bb): Likewise. Delete known locations for MO_SET and MO_CLOBBER. (find_variable_location_part): New function. (set_variable_part, delete_variable_part): Use it. (clobber_variable_part): New function. * dwarf2out.c (dwarf2out_var_location): Do not follow debug decl link. From-SVN: r116031
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