[3.14] gh-140815: Fix faulthandler for invalid/freed frame (GH-140921) (#140981)

[3.14] gh-140815: Fix faulthandler for invalid/freed frame (GH-140921) (#140981)

gh-140815: Fix faulthandler for invalid/freed frame (GH-140921)

faulthandler now detects if a frame or a code object is invalid or
freed.

Add helper functions:

* _PyCode_SafeAddr2Line()
* _PyFrame_SafeGetCode()
* _PyFrame_SafeGetLasti()

_PyMem_IsPtrFreed() now detects pointers in [-0xff, 0xff] range
as freed.
(cherry picked from commit a84181c31bfc45a1d6bcb1296bd298ad612c54d0)

Co-authored-by: Victor Stinner <vstinner@python.org>