Java to Kotlin converter: keep original placement of primary constructor body + better preserving of comments for constructor

j2k/tests/testData/ast/comments/commentsForConstructors.java

@@ -0,0 +1,25 @@
+//file
+class A {
+    private int v;
+
+    // this is a primary constructor
+    A(int p) {
+        v = 1;
+    } // end of primary constructor body
+
+    // this is a secondary constructor
+    A() {
+        this(1);
+    } // end of secondary constructor body
+}
+
+class B {
+    private int x;
+
+    // this constructor will disappear
+    B(int x) {
+        this.x = x;
+    } // end of constructor body
+
+    void foo(){}
+}