c++: Fix ICE with concepts and aliases [PR93907].
The problem here was that we were checking satisfaction once with 'e', a
typedef of 'void', and another time with 'void' directly, and treated them
as different for hashing based on the assumption that
canonicalize_type_argument would have already removed a typedef that wasn't
a complex dependent alias. But that wasn't happening here, so let's add a
call.
gcc/cp/ChangeLog
2020-03-11 Jason Merrill <jason@redhat.com>
PR c++/93907
* constraint.cc (tsubst_parameter_mapping): Canonicalize type
argument.
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