Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/increment/classNaryGetSet.kt

@@ -0,0 +1,15 @@
+object A {
+    var x = 0
+
+    operator fun get(i1: Int, i2: Int, i3: Int): Int = x
+
+    operator fun set(i1: Int, i2: Int, i3: Int, value: Int) {
+        x = value
+    }
+}
+
+fun box(): String {
+    A.x = 0
+    val xx = A[1, 2, 3]++
+    return if (xx != 0 || A.x != 1) "Failed" else "OK"
+}