[issue31420] Reference leaks introduced by bpo-30860

[Eric Snow]

Eric Snow added the comment:

Moving warnoptions (and xoptions) out of PyInterpreterState seems like a good idea to me for the same reasons as applied to sys.modules.  The case for these two is even stronger since they are only used in sysmodule.c.

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<https://bugs.python.org/issue31420>
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