Code Insight: "Generate secondary constructor" action

#KT-6970 Fixed

idea/testData/codeInsight/generate/secondaryConstructors/javaSupers.kt.after

@@ -0,0 +1,16 @@
+// ACTION_CLASS: org.jetbrains.kotlin.idea.actions.generate.KotlinGenerateSecondaryConstructorAction
+class Foo<U> : Base<U, Int> {
+    val x = 1
+
+    <caret>constructor(x: U) : super(x)
+
+    constructor(x: U, y: Int?) : super(x, y)
+
+    fun foo() {
+
+    }
+
+    fun bar() {
+
+    }
+}