Can be constructor property: comment saver introduced to retain comments; unbound comments now added before, not after

(cherry picked from commit 886cf21)

idea/testData/intentions/simplifyAssertNotNull/commentsNoMessage.kt.after

@@ -2,7 +2,8 @@
 // WITH_RUNTIME
 
 fun foo(p: Array<String?>) {
-    val v = p[0]!!<caret>/* null */
+    /* null */
+    val v = p[0]!!
     // now let's check it for null
     // 'v' should not be null
 }