Generate equals and hashCode: enable for data classes #KT-17502 Fixed

idea/testData/codeInsight/generate/equalsWithHashCode/dataClass.kt

@@ -1,2 +1 @@
-// NOT_APPLICABLE
 data class A<caret>(val n: Int)

idea/testData/codeInsight/generate/equalsWithHashCode/dataClass.kt.after

@@ -0,0 +1,16 @@
+data class A(val n: Int) {
+    <caret>override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as A
+
+        if (n != other.n) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return n
+    }
+}