C++ PATCH for c++/51827 (mangling error with PCH and LTO)

[Jason Merrill]

When outputting PCH/LTO, the compiler tries to generate mangled names 
for all decls before discarding language-specific data.  But that 
doesn't make sense for templates, and leads to conflicts in this case. 
Fixed by refusing to mangle templates.

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