C++ PATCH for c++/60353 (bogus error with unnamed class)

[Jason Merrill]

The code I factored out of expand_or_defer_fn_1 into 
tentative_decl_linkage is intended for use with functions that are 
defined; using it on functions that have not been defined causes problems.

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