C++ PATCH for c++/32470 (namespace visibility bug)

[Jason Merrill]

My earlier implementation of namespace visibility assumed that only the 
parser would be calling push_namespace_with_attrs, which of course is 
not actually the case.  So this patch fixes the bug by moving the 
visibility handling out of push_namespace into the parser.

Tested x86_64-pc-linux-gnu, applied to trunk.  Will apply to 4.2 when it 
unfreezes.

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