C++ PATCH for c++/85356, C++17 ICE with pointer to member function in template

[Jason Merrill]

We weren't instantiating exception-specifications when a template
referred to them, but that won't fly in the C++17 world where they're
part of the type, so we need to resolve them to do overload resolution
for non-dependent expressions.

The change to check_redeclaration_exception_specification is necessary
because type_dependent_expression_p (fn) will fail for a dependent
new_decl, beacuse it doesn't have DECL_TEMPLATE_INFO yet.

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