[pull] main from python:main - #1327
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…ree threading (gh-153720) Under high thread concurrency in free-threaded builds, `_Py_Specialize_LoadGlobal` suffers from lock contention when acquiring the critical section mutexes for the `globals` and `builtins` dictionaries during bytecode specialization. This PR skips LOAD_GLOBAL bytecode specialization if acquiring the two object mutexes would block.
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