[6.0][lldb] Update Python deprecated APIs. #8980
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1. Remove usage of PyEval_ThreadsInitialized and PyEval_InitThreads
Both of these functions were removed in Python 3.13 [1] after being
deprecated since Python 3.9.
According to "What's new in Python 3.13" document [1]:
Since Python 3.7, Py_Initialize() always creates the GIL: calling
PyEval_InitThreads() did nothing and PyEval_ThreadsInitialized()
always returned non-zero.
2. Replace _Py_IsFinalizing() with Py_IsFinalizing().
[1] https://docs.python.org/3.13/whatsnew/3.13.html
(cherry picked from commit b2929be)
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This patch cherry-picks some changes from the swift/release/5.10 branch,
where the patches are originally taken from the upstream llvm-project.
Cherry-pick from swift/release/5.10: #7756
Reason: Without this patch, Linux distros with Python 3.13 will
fail to build LLDB due to the usage of removed APIs.
Example error from Fedora Rawhide:
https://download.copr.fedorainfracloud.org/results/leebc/swift-lang-beta/fedora-rawhide-aarch64/07730697-swift-lang/builder-live.log.gz