Serialize secondary constructors

compiler/testData/compileKotlinAgainstKotlin/SecondaryConstructors.A.kt

@@ -0,0 +1,9 @@
+open class A {
+    val prop: String
+    constructor(x1: String, x2: String = "abc") {
+        prop = "$x1#$x2"
+    }
+    constructor(x1: Long) {
+        prop = "$x1"
+    }
+}

compiler/testData/compileKotlinAgainstKotlin/SecondaryConstructors.B.kt

@@ -0,0 +1,25 @@
+import java.lang
+
+class B1() : A("123") {
+    constructor(x1: Int): this() {}
+}
+
+class B2 : A {
+    constructor(x1: String): super(x1) {}
+    constructor(): this("empty") {}
+    constructor(x1: Int): super(x1.toLong()) {}
+}
+
+fun main(args: Array<String>) {
+    val b1 = B1()
+    if (b1.prop != "123#abc") throw AssertionError("fail1: ${b1.prop}")
+    val b2 = B1(456)
+    if (b2.prop != "123#abc") throw AssertionError("fail2: ${b2.prop}")
+
+    val b3 = B2("cde")
+    if (b3.prop != "cde#abc") throw AssertionError("fail3: ${b3.prop}")
+    val b4 = B2()
+    if (b4.prop != "empty#abc") throw AssertionError("fail4: ${b4.prop}")
+    val b5 = B2(789)
+    if (b5.prop != "789") throw AssertionError("fail5: ${b5.prop}")
+}