[Bug fortran/18977] LAPACK test xeigtsts segfaults with optimization

[pbrook at gcc dot gnu dot org]

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Bug 18977 depends on bug 17675, which changed state.

Bug 17675 Summary: [Regression w.r.t. g77] Alignment constraints not honored in EQUIVALENCE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17675

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18977