[issue40255] Fixing Copy on Writes from reference counting and immortal objects

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I think making more objects immortal by default will reduce the gap, although I am not sure it can be 2%. (I guess 3% and I think it is acceptable gap.)

* Code attributes (contents of co_consts, co_names, etc...) in deep frozen modules.
  * only if subinterpreter shares them.
* Statically allocated strings (previously _Py_IDENTIFIER)

To reduce gap more, we need to reduce Python stack operation in ceval in some way.

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<https://bugs.python.org/issue40255>
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