[PATCH] Option parsing: allow alias arguments

[Reid Kleckner]

  LGTM


================
Comment at: utils/TableGen/OptParserEmitter.cpp:242
@@ -230,1 +241,3 @@
 
+    // The option alias arguments (if any).
+    OS << ", ";
----------------
You could elaborate here on the string format.


http://llvm-reviews.chandlerc.com/D1245