getAttrAddr

    fn getAttrAddr(
        self: *const Die,
        di: *const Dwarf,
        endian: Endian,
        id: u64,
        compile_unit: *const CompileUnit,
    ) error{ InvalidDebugInfo, MissingDebugInfo }!u64 {
        const form_value = self.getAttr(id) orelse return error.MissingDebugInfo;
        return switch (form_value.*) {
            .addr => |value| value,
            .addrx => |index| di.readDebugAddr(endian, compile_unit, index),
            else => bad(),
        };
    }