Simplify for: take into account local property mutability

idea/testData/intentions/iterationOverMap/DataClassWithLocalPropertyModified.kt

@@ -0,0 +1,13 @@
+// IS_APPLICABLE: false
+// WITH_RUNTIME
+
+data class XY(val x: String, val y: Int)
+fun test(xys: Array<XY>) {
+    for (<caret>xy in xys) {
+        val x = xy.x
+        var y = xy.y
+        println(x + y)
+        y--
+        println(y)
+    }
+}