[issue23689] Memory leak in Modules/sre_lib.h

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

Try to allocate SRE_REPEAT on state's stack, the performance has not changed significantly.

It passes the other tests, except this one (test_stack_overflow):
https://github.com/python/cpython/blob/v3.8.0a1/Lib/test/test_re.py#L1225-L1230

I'll try to fix issue35859, issue9134 first.

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versions: +Python 3.8 -Python 2.7, Python 3.6, Python 3.7

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