C++ PATCH for c++/65646 (ICE after error specializing missing static data member)

Wed Apr 1 16:36:00 GMT 2015

This testcase started crashing because the added call to 
check_explicit_specialization does a SET_DECL_TEMPLATE_SPECIALIZATION 
which wasn't happening previously, and then determine_visibility assumes 
that if DECL_USE_TEMPLATE is set, so is DECL_TEMPLATE_INFO.  Fixed for 
GCC 5 by avoiding the call if we aren't dealing with a member template.

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