gh-140067: Fix memory leak in subinterpreter creation #140148
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ashm-dev
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ZeroIntensity and
ericsnowcurrently
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The memcpy() call in _PyInterpreterState_New() was overwriting the
_malloced pointer that was set by alloc_interpreter(), causing a memory
leak when subinterpreters were destroyed.
Fixed by preserving the _malloced pointer across the memcpy().
CC: @ZeroIntensity This is a fixed version without problems with asan and tsan.