README.rst: List out relevant links to the project by Mariatta · Pull Request #283 · python/cpython

(cherry picked from commit e32ec93)

Extract the platform specific stack handling form "slp_eval_frame" into
a new function "slp_cstack_set_base_and_goodgap" in slp_transfer.c.

Move the definition of SLP_DO_NOT_OPTIMIZE_AWAY from pycore_stackless.h
to slp_transfer.c, because it is only used there.

Integrate include "pycore_slp_platformselect.h" into slp_transfer.c and
remove this include.

Move "slp_transfer.c" form "Stackless/core" to "Stackless/platf",
because it depends on the platform.

Move all pycore_slp_switch_*.h includes from Include/internal to
Stackless/platf. These headers are included by "slp_transfer.c" only.

…p_transfer.c and eliminate pycore_slp_platformselect.h

Extract the platform specific stack handling form "slp_eval_frame" into
a new function "slp_cstack_set_base_and_goodgap" in slp_transfer.c.
Move the definition of SLP_DO_NOT_OPTIMIZE_AWAY from pycore_stackless.h
to slp_transfer.c, because it is only used there.
Integrate include "pycore_slp_platformselect.h" into slp_transfer.c and
remove this header file.
Move "slp_transfer.c" form "Stackless/core" to "Stackless/platf",
because it depends on the platform.
Move all pycore_slp_switch_*.h header files from Include/internal to
Stackless/platf. These headers are included by "slp_transfer.c" only.

…igure*

The list of Stackless code directories needed an update.

slp_transfer.c and eliminate pycore_slp_platformselect.h

Restore the definition of SLP_CSTACK_MAXCACHE.