C++ testsuite PATCH to accommodate default -Wabi

[Jason Merrill]

As part of my work on c++/12909 (vector mangling), I wanted to turn on 
-Wabi by default.  Mark argued against this, saying that a large 
proportion of G++ users don't rely on binary compatibility between 
different compiler releases, so the warning would just be extra noise. 
So I think that change will become a Red Hat local patch.

This patch just adjusts several tests to avoid extra warnings in the 
presence of that patch, so that the results are the same with or without it.

Tested x86_64-pc-linux-gnu, applied to trunk.
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