New issue 2764: cpyext PyEval_SaveThread/PyGILState_Ensure/PyErr_SetString
failure
https://bitbucket.org/pypy/pypy/issues/2764/cpyext-pyeval_savethread-pygilstate_ensure
pv:
The following construction doesn't seem to work as expected with cpyext:
```
save = PyEval_SaveThread();
...
gilsave = PyGILState_Ensure();
PyErr_SetString(PyExc_RuntimeError, "XXX");
PyGILState_Release(gilsave);
...
PyEval_RestoreThread(save);
assert(PyErr_Occurred());
```
It appears that there are race conditions in this, so that another thread may
end up with a spurious error status, or the assertion can fail.
A test case:
https://github.com/pv/cpyextcrash1/tree/020f114b5e6e1af69ab776a1265332d8d8c5ff0b
It passes on CPython, but not on Pypy3-5.10.1 or pypy2-5.10.0
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