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[committed] testcase for PR 22625


This another testcase for the problem which Diego found yesterday for &b->c being
considered a deference so VRP said b was non-null.


I committed this in as obvious. It also shows that in C++, it is easier to
hit this bug than it is in C.



Thanks, Andrew Pinski


ChangeLog:


* g++.dg/opt/vrp2.C: New test.

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