Additional simple test for variable initialize in secondary constructor

compiler/testData/diagnostics/tests/secondaryConstructors/initializeValInConstructor.kt

@@ -0,0 +1,6 @@
+class A {
+    val x: Int
+    constructor(x: Int) {
+        this.x = x
+    }
+}

compiler/testData/diagnostics/tests/secondaryConstructors/initializeValInConstructor.txt

@@ -0,0 +1,9 @@
+package
+
+public final class A {
+    public constructor A(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}