c++: alias template template_info setting

Nathan Sidwell nathan@acm.org
Tue Aug 18 21:52:12 GMT 2020

During the construction of alias templates we can alter its
template_info.  This is really weird, because that's morally immutable
data.  In this case it's ok, but let's not create a duplicate
template_info, and add asserts to make sure it is changing in exactly
the way we expect.

Needless to say modules fell over the duplicated template_info and got 
very confused.

         * cp-tree.h (SET_TYPE_TEMPLTE_INFO): Do not deal with ALIAS 
         * pt.c (lookup_template_class_1): Special-case alias template
         template_info setting.

Nathan Sidwell
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