preserve comments: concatenation to message format

compose tests into one

java/java-tests/testData/codeInsight/concatenationToMessageFormat/comments.after.java

@@ -0,0 +1,11 @@
+class Simple {
+
+  void f(String a, String b) {
+      //a before arg
+      //comment
+      //after literal
+      /*before arg*/
+      String s = java.text.MessageFormat.format("a:{0}b:{1}", a, b); //end comment
+
+  }
+}