[C++ PATCH for 3.3] Fix PR13797 (missing error_mark_node check)

[Gabriel Dos Reis]

Kriang Lerdsuwanakij <lerdsuwa@users.sourceforge.net> writes:

| Hi
| 
| This is the 3.3 version of patch for PR13797 regression.  Fixing PR13797
| requires an additional error_mark_node checking patch from the main trunk:
| 
| 	http://gcc.gnu.org/ml/gcc-patches/2003-05/msg00757.html
| 
| The expected error for the testcase is different in 3.3 branch however.
| So I put together all the required changes here.  Tested on i686-pc-linux-gnu.
| Ok for 3.3 branch?

Yes.  Thanks,

-- Gaby