C++ PATCH for c++/60848 (ICE with user-defined std::initializer_list)

[Jason Merrill]

Here the testcase defines std::initializer_list as a non-template class, 
so looking up its argument fails.  I don't want to get into a lot of 
sanity checking for the definition of initializer_list, but this seems 
simple enough.

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