Delete generated test cases, move testData to boxWithStdlib

compiler/testData/codegen/boxWithStdlib/dataClasses/arrayParams.kt

@@ -0,0 +1,10 @@
+data class A(val x: Array<Int>, val y: IntArray)
+
+fun foo(x: Array<Int>, y: IntArray) = A(x, y)
+
+fun box(): String {
+    val a = Array<Int>(0, {0})
+    val b = IntArray(0)
+    val (x, y) = foo(a, b)
+    return if (a == x && b == y) "OK" else "Fail"
+}