c++: Fix nullptr deref [pr97460[

[Nathan Sidwell]

My changes to friend handling meant that there are now cases where a
friend doesn't get a lang-specific object.  So we need to check	there
is one before looking inside it.

         PR c++/97460
         gcc/cp/
         * pt.c (push_template_decl): Check DECL_LANG_SPECIFIC in friend
         case.
         gcc/testsuite/
         * g++.dg/template/pr97460.C: New.

pushing to trunk

nathan
-- 
Nathan Sidwell
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