[issue19787] tracemalloc: set_reentrant() should not have to call PyThread_delete_key()

[Charles-François Natali]

Charles-François Natali added the comment:

AFAICT, there's no link (FWIW I wrote the patch for #10517, then the fix
for threads created outside of Python calling into a subinterpreter -
issue #13156).
Actually, this "fix" would have avoided the regression in issue #13156.
But since it's tricky, I'd really like if Graham could test it (his module
does a lot of nasty things that could not show up in our test suite).

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nosy: +grahamd

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