[Issue 7629] Add check for ref/out parameters not being null

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7629



--- Comment #1 from Denis <verylonglogin.reg at gmail.com> 2012-03-02 18:51:54 MSK ---
I meant the issue is that if ref null argument isn't used no RT error is
generated, `Access violation` for null out argument isn't perfect but is
acceptable and corresponds to member function call on null object reference.

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