Add support for methods which wrap arguments in implicit classes

[isaacflaum]

val a: String = null
?(a.toInt) // throws NumberFormatException

The above snippet fails due to Scala wrapping a in an implicit class and the macro not knowing how to check for null properly in this instance. The snippet below is what the above code compiles to. The macro should instead check if a is != null and apply the wrapper in the body of the if.

{
  <synthetic> val fresh$macro$1: scala.collection.StringOps = scala.Predef.augmentString(a);
  if (fresh$macro$1.$bang$eq(null))
    fresh$macro$1.toInt
  else
    null
}

[ryanstull]

Fixed in version 1.2.6