C++ PATCH for variable template partial specialization bug

[Jason Merrill]

register_specialization complains about a specialization in a different 
namespace from the main template; we shouldn't give that error about an 
instantiation of a partial specialization.  And we were about to 
SET_DECL_IMPLICIT_INSTANTIATION anyway, so let's just do that before we 
call register_specialization.

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