C++ PATCH to note_decl_for_pch for c++/28217

[Jason Merrill]

28217 is a problem whereby something that compiles fine normally doesn't 
compile for a PCH, because the PCH code is being too aggressive about 
trying to premangle decls to save work later.  We never mangle 
uninstantiated templates, so it shouldn't try.

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

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