Fix formatting regression introduced by r174307.

In preprocessor definitions, we would not parse all the tokens and thus
not annotate them anymore. This led to a wrong formatting of comments
in google style:

  #endif // HEADER_GUARD  -- requires two spaces

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174361 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index 34bccb9..f34bc89 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -423,6 +423,8 @@
     default:
       break;
     }
+    while (CurrentToken != NULL)
+      next();
   }
 
   LineType parseLine() {