egcs-970907: covariant return type + virtual inheritance = core

[Jay Sachs]

The attached program compiles & links fine, but dies with a bus error
at the line marked (*1*).  Somewhat surprisingly, the value of the
pointer printed just before that line is the same as in line (*2*).

There is no problem if class B inherits non-virtually from A.

This is on a Sparc Ultra, SunOS 5.5.1.

-Jay
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