RFA: Check for corruption of cv_type chain

[Michael Elizabeth Chastain]

! # These tests are intended to catch problems in the STABS reader, so I
! # think it's okay to override the preference the user expressed in
! # their $DEJAGNU file or whatever, and explicitly request extended
! # stabs debugging information.  But, if we don't know how to do that,
! # these tests still should pass just fine if the executable uses some
! # other format.

As Daniel J said, please don't do that.

This makes life harder for me.  I'd like the tests to be agnostic about
the configurations, and then have the test bed software iterate over
all the interesting configurations.

Suppose that a similar bug started happening with -gdwarf-3, or with a
coff version of gcc (such as Cygwin's gcc), or with the native Solaris
or Irix or HP-UX C++ compiler?

Michael C