Minor tblgen patch

The attached patch fixes an error message emitted by tblgen when no subclasses
of 'Target' are defined. In the current version the message is

   ERROR: Multiple subclasses of Target defined!

which is a bit confusing.

- Volodya

CodeGenWrappers.diff (1.03 KB)

Applied:

http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040531/015004.html

Thanks!