Plist diagnostics: distinguish between regular and extended messages for "events".

llvm-svn: 67269
diff --git a/clang/lib/Frontend/PlistDiagnostics.cpp b/clang/lib/Frontend/PlistDiagnostics.cpp
index 16c5c10..1adc99c 100644
--- a/clang/lib/Frontend/PlistDiagnostics.cpp
+++ b/clang/lib/Frontend/PlistDiagnostics.cpp
@@ -151,6 +151,11 @@
   
   // Output the text.
   assert(!P.getString().empty());
+  Indent(o, indent) << "<key>extended_message</key>\n";
+  Indent(o, indent) << "<string>" << P.getString() << "</string>\n";
+  
+  // Output the short text.
+  // FIXME: Really use a short string.
   Indent(o, indent) << "<key>message</key>\n";
   Indent(o, indent) << "<string>" << P.getString() << "</string>\n";