Reduce overhead of pushing and popping frames in Python-to-Python calls.

The cost of pushing a frame for Python-to-Python calls is much lower than it used to be, but still considerably higher than it could be.

Pushing a frame should be little more than a space check and a pointer bump. Similarly popping the frame, should just be a pointer adjustment.

We want to be able to add "shim" and proxy frames for performance and debugging. To be able to do that, the cost of frame popping and pushing should be as low as possible.

未指定任何檔案、測試或具體入口點。首先定位 Python-to-Python 呼叫的 frame push 和 pop 實作，然後建立目前額外負荷的測量；完成的標準是，在保留對 shim frame 和 proxy frame 支援的同時，將這些操作朝著所述的 space-check、pointer-bump 和指標調整目標進行縮減。