[PATCH] Don't segfault when uniquifying hidden tied arrays

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The following code snippet triggers a segmentation fault:

zsh -c 'typeset -T VAR var; () { typeset -i var=1; typeset -g -U VAR }'
zsh: segmentation fault

- Don't segfault when uniquifying hidden tied arrays
<https://github.com/paltherr/zsh/compare/dont-segfault-when-uniquifying-hidden-tied-arrays-start...paltherr:zsh:dont-segfault-when-uniquifying-hidden-tied-arrays>

Philippe

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<div dir=3D"ltr"><div>The following code snippet triggers a segmentation fa=
ult:</div><div><br></div><font face=3D"monospace">zsh -c &#39;typeset -T VA=
R var; () { typeset -i var=3D1; typeset -g -U VAR }&#39;<br>zsh: segmentati=
on fault<br></font><div><br></div><div>-=C2=A0<a href=3D"https://github.com=
/paltherr/zsh/compare/dont-segfault-when-uniquifying-hidden-tied-arrays-sta=
rt...paltherr:zsh:dont-segfault-when-uniquifying-hidden-tied-arrays">Don&#3=
9;t segfault when uniquifying hidden tied arrays</a></div><div><br></div><d=
iv>Philippe</div><div><br></div></div>

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