C++ PATCH for c++/47049 (ICE with lambda in template)

[Jason Merrill]

The problem with this testcase was that we were trying to generate the 
mangled name of an uninstantiated lambda; we shouldn't ever try to 
mangle an uninstantiated template.  So I changed 
start_preparsed_function to avoid that.  After that was fixed, I found 
that I also needed to modify maybe_add_lambda_conv_op so that it would 
get the right comdat group for op() even if it hasn't been instantiated yet.

To guard against similar problems in future I added an assert to 
mangle_decl_string so that we don't try to mangle templates anymore. 
This revealed an issue with the #pragma interface code, also fixed.

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