Java to Kotlin converter: code refactorings after review

j2k/tests/testData/ast/constructors/artificialPrimary.java

@@ -0,0 +1,14 @@
+//file
+public class Test {
+  private final String s;
+  boolean b;
+  double d;
+
+  public Test() {
+    b = true;
+  }
+
+  public Test(String s) {
+    this.s = s;
+  }
+}

j2k/tests/testData/ast/constructors/artificialPrimary.kt

@@ -0,0 +1,14 @@
+public fun Test(): Test {
+    val __ = Test(null)
+    __.b = true
+    return __
+}
+
+public fun Test(s: String): Test {
+    return Test(s)
+}
+
+public class Test(private val s: String) {
+    var b: Boolean = false
+    var d: Double = 0.toDouble()
+}