Don't allow inline block comments to eat pending newlines.

test/comments/top_level.unit

Index: test/comments/top_level.unit
diff --git a/test/comments/top_level.unit b/test/comments/top_level.unit
index 6eb7405422732c2d97c84edfdd9bf767608ff030..c286d87b6ed20c0d1f65c12a39495b559436a496 100644
--- a/test/comments/top_level.unit
+++ b/test/comments/top_level.unit
@@ -184,4 +184,17 @@ library a.//
 b.c;
 <<<
 library a. //
-    b.c;
+    b.c;
+>>> block comment between different kinds of directives
+library a; /* comment */ import 'b.dart';
+<<<
+library a;
+
+/* comment */
+import 'b.dart';
+>>> block comment between directives
+import 'a.dart'; /* comment */ import 'b.dart';
+<<<
+import 'a.dart';
+/* comment */
+import 'b.dart';