Generate equals/hashCode(): Use class literals when possible

#KT-18683 Fixed

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

@@ -0,0 +1,8 @@
+// PLATFORM: JavaScript
+class A(val n: Int, val s: String) {<caret>
+    val f: Float = 1.0f
+
+    fun foo() {
+
+    }
+}