Add tags so emacs knows these are C++ files

llvm-svn: 483
diff --git a/llvm/lib/CodeGen/RegAlloc/IGNode.h b/llvm/lib/CodeGen/RegAlloc/IGNode.h
index 03bcfc0..2f437f9 100644
--- a/llvm/lib/CodeGen/RegAlloc/IGNode.h
+++ b/llvm/lib/CodeGen/RegAlloc/IGNode.h
@@ -1,4 +1,4 @@
-/* Title:   IGNode.h
+/* Title:   IGNode.h                      -*- C++ -*-
    Author:  Ruchira Sasanka
    Date:    July 25, 01
    Purpose: Represents a node in an interference graph.