Add support for dos style files.

llvm-svn: 13836
diff --git a/llvm/utils/TableGen/FileLexer.l b/llvm/utils/TableGen/FileLexer.l
index 9b7973c..d684040 100644
--- a/llvm/utils/TableGen/FileLexer.l
+++ b/llvm/utils/TableGen/FileLexer.l
@@ -205,7 +205,7 @@
 
 {Integer}      { Filelval.IntVal = ParseInt(Filetext); return INTVAL; }
 
-[ \t\n]+       { /* Ignore whitespace */ }
+[ \t\n\r]+     { /* Ignore whitespace */ }
 
 
 "/*"                    { BEGIN(comment); CommentDepth++; }