Backport "Fix #22794: Emit the definition of Arrays.newArray even though it's a primitive." to 3.7.0 #22801
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… it's a primitive. Until 3.6.x, we used the user-space definition of `Arrays.newArray` in Scala.js. We changed it to a primitve in 2852168, to match the behavior of the JVM backend. However, that had the side effect of not emitting its definition at all, like other primitives. For backward binary compat reasons, we do need that definition. We specifically make an exception for that method, which is now emitted, even though it is otherwise treated as a primitive.
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Backports #22797 to Scala 3.7.0-RC2