Initial work to improve documentation for Clang's diagnostics, from Matthieu Monrocq

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129614 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/TextDiagnosticPrinter.cpp b/lib/Frontend/TextDiagnosticPrinter.cpp
index a228495..47c942c 100644
--- a/lib/Frontend/TextDiagnosticPrinter.cpp
+++ b/lib/Frontend/TextDiagnosticPrinter.cpp
@@ -908,6 +908,13 @@
   llvm::SmallString<100> OutStr;
   Info.FormatDiagnostic(OutStr);
 
+  if (DiagOpts->ShowNames &&
+      !DiagnosticIDs::isBuiltinNote(Info.getID())) {
+    OutStr += " [";
+    OutStr += DiagnosticIDs::getName(Info.getID());
+    OutStr += "]";
+  }
+  
   std::string OptionName;
   if (DiagOpts->ShowOptionNames) {
     // Was this a warning mapped to an error using -Werror or pragma?