gh-148058: Do not refleak when XMLParser.__init__() called many times
#187897
| Job | Run time |
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| -1s | |
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| 12m 5s | |
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| 11m 54s | |
| 1m 55s | |
| 5m 48s | |
| 11m 9s | |
| 2m 4s | |
| 1m 53s | |
| 2s | |
| 5h 49m 36s |