linter: improved unused checker
#1212
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In the following cases: $bar = 1; $obj->foo($bar); no need to throw a warning about an unused variable, if it inside magic method call.
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In the following cases:
$bar = 1;
$obj->foo($bar); // consider
$objhas__callmagic method.no need to throw a warning about an unused variable, if it inside magic method call.