Support C++11 attributes at the start of a parameter-declaration.

llvm-svn: 154476
diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index 5ce6b2b..28c5e8b 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -1322,6 +1322,11 @@
         return TPResult::False();
     }
 
+    // An attribute-specifier-seq here is a sign of a function declarator.
+    if (isCXX11AttributeSpecifier(/*Disambiguate*/false,
+                                  /*OuterMightBeMessageSend*/true))
+      return TPResult::True();
+
     ParsedAttributes attrs(AttrFactory);
     MaybeParseMicrosoftAttributes(attrs);