[PATCH] handle member references in -Waddress [PR96507]

[Martin Sebor]

While going through old -Waddress bug reports to close after
the recent improvements to the warning I came across PR 96507
that points out that member references aren't handled.  Since
testing the address of a reference for equality to null is
in general diagnosed, this seems like an oversight worth fixing.
  Attached is a change to the C++ front end to diagnose member
references as well.

Tested on x86_64-linux.

Martin
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