[issue39146] too much memory consumption in re.compile unicode

[Zhipeng Xie]

Zhipeng Xie <775350901 at qq.com> added the comment:

> but range() was here before ebd48b4f650d.

before ebd48b4f650d, _optimize_unicode use xrange. So python2.7.8 is ok and python2.7.9 consume much memory in my test case.

> Obviously there are other causes of the difference between 2.7 and 3.x.

Maybe it is because my python was compiled with --enable-unicode=ucs4.

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