[REG2.064a] Issue 11197 - Struct with postblit cannot be appended to an AA of arrays

http://d.puremagic.com/issues/show_bug.cgi?id=11197

The regression was introduced by: https://github.com/D-Programming-Language/dmd/commit/cb8b4c7bc3c461827f1bab6daf6d9ee7ffebe1dd#diff-31ec3d6838ade0264adec0944948507dR11864