C++ PATCH for Core DR 1558

[Jason Merrill]

Core DR 1558 clarifies that even though an alias template specialization 
is equivalent to its expansion, we still need to remember the 
template-id and substitute into it at instantiation time.  So we need to 
avoid stripping it in strip_typedefs and treat it as different in 
template_args_equal.  While I was looking at this I also noticed that 
the existing wording also says that such a template-id is dependent even 
if it is equivalent to a non-dependent type.

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