Use toVector for XML literal sequences
#11065
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In `<a><b/><c/><a>`, a `NodeBuffer` (which extends `ArrayBuffer`) is
used to accumulate the children. The buffer is passed to
`new Elem($buf: _*)`, which only works thanks to the implicit
`collection.Seq[Node] => NodeSeq` declared in scala-xml.
With `-Vprint:typer`:
```scala
scala> <a><b/></a>
[[syntax trees at end of typer]] // <console>
private[this] val res0: scala.xml.Elem = new scala.xml.Elem(null, "a", scala.xml.Null, scala.xml.TopScope, false, (xml.this.NodeSeq.seqToNodeSeq({
val $buf: scala.xml.NodeBuffer = new scala.xml.NodeBuffer();
$buf.&+(new scala.xml.Elem(null, "b", scala.xml.Null, scala.xml.TopScope, true));
$buf
}): _*));
```
The implicit was not inserted in 2.12 because the varargs parameter of
Elem accepted a `collection.Seq`.
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In
<a><b/><c/><a>, aNodeBuffer(which extendsArrayBuffer) is used to accumulate the children. The buffer is passed tonew Elem($buf: _*), which only works thanks to the implicitcollection.Seq[Node] => NodeSeqdeclared in scala-xml.With
-Vprint:typer:The implicit was not inserted in 2.12 because the varargs parameter of Elem accepted a
collection.Seq.