Move helper class into an anonymous namespace.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160172 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
index d0c988d..e95af05 100644
--- a/lib/Parse/Parser.cpp
+++ b/lib/Parse/Parser.cpp
@@ -23,6 +23,7 @@
 #include "clang/AST/ASTConsumer.h"
 using namespace clang;
 
+namespace {
 /// \brief A comment handler that passes comments found by the preprocessor
 /// to the parser action.
 class ActionCommentHandler : public CommentHandler {
@@ -36,6 +37,7 @@
     return false;
   }
 };
+} // end anonymous namespace
 
 IdentifierInfo *Parser::getSEHExceptKeyword() {
   // __except is accepted as a (contextual) keyword