completion problem with '291' ok with '274'.

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

   $ /usr/local/bin<< change to where all my builds are.
   zsh-5.0.7-291-gda86d6b  << most recent build here.

   $ ./zsh<TAB>  << no luck
   $ ./zsh<TAB> << no luck
   $ ./zsh<TAB>-5.0.7-<TAB> ... << ok 3d time, but it was as likely to
   crash the xterm.

   $ ./zsh-5.0.7-274-gce211bb << try an older build.
   zsh-5.0.7-274-gce211bb


... no completion problems with '274'. I went back and forth between 
'291' and '274' and every time '291' was unstable completing, whereas 
'274' was fine. Most often '291' caused the xterm to crash.

Binary here is all static link, but plain vanilla otherwise.