Fix the 'fixit' for inline namespace replacement.

I'd neglected to add to the fixit for r346677.  Richard Smith mentioned
this in a review-after-commit, so fixing it here.

Change-Id: I77e612be978d4eedda8d5bbd60b812b88f875cda
llvm-svn: 346705
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 85c972f..d29ce24 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -178,7 +178,10 @@
     } else {
       std::string NamespaceFix;
       for (const auto &ExtraNS : ExtraNSs) {
-        NamespaceFix += " { namespace ";
+        NamespaceFix += " { ";
+        if (ExtraNS.InlineLoc.isValid())
+          NamespaceFix += "inline ";
+        NamespaceFix += "namespace ";
         NamespaceFix += ExtraNS.Ident->getName();
       }