Support decltype in nested-name-specifiers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145785 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index 75fc9be..dcbee4f 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -664,6 +664,7 @@
     ConsumeToken();
     break;
       
+  case tok::kw_decltype:
   case tok::identifier: {      // primary-expression: identifier
                                // unqualified-id: identifier
                                // constant: enumeration-constant