i686 optimized pthread causes vm86() prog coredump

[Aaron Cui]

hi,

glibc's linuxthreads uses modify_ldt() for i686
optimized version, and 
this
caused core dump for the program that uses vm86()
(such as dosemu, 
wine...).

if normal (unoptimized) version of pthread is used,
then everything 
works
fine.

attached with a testing program shows this program.

cheers,
  -- Pengcheng Zou

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