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find python frames without probing (possibly optimized-out by LTO) _PyEval_EvalFrameDefault - #276
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Some CPython builds use LTO which can split or refactor calls to
_PyEval_EvalFrameDefault, causingIS_VMPROF_EVALto fail. This is more prevalent on recent builds (3,13 and up). Probe differently: at eval time determine the address of python frames.