Minor: move callable reference IR tests to a separate directory

compiler/testData/ir/irText/expressions/callableReferences/withVarargViewedAsArray.kt

@@ -0,0 +1,22 @@
+// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
+
+fun sum(vararg args: Int): Int {
+    var result = 0
+    for (arg in args)
+        result += arg
+    return result
+}
+
+fun nsum(vararg args: Number) = sum(*IntArray(args.size) { args[it].toInt() })
+
+fun zap(vararg b: String, k: Int = 42) {}
+
+fun usePlainArgs(fn: (Int, Int) -> Int) {}
+fun usePrimitiveArray(fn: (IntArray) -> Int) {}
+fun useArray(fn: (Array<Int>) -> Int) {}
+fun useStringArray(fn: (Array<String>) -> Unit) {}
+
+fun testPlainArgs() { usePlainArgs(::sum) }
+fun testPrimitiveArrayAsVararg() { usePrimitiveArray(::sum) }
+fun testArrayAsVararg() { useArray(::nsum) }
+fun testArrayAndDefaults() { useStringArray(::zap) }