Inserting shim frames simplifiesRETURN_VALUE,YIELD_VALUE andRETURN_GENERATOR and enablesfor to be specialized for generators, andawait to be specialized for coroutines.

Seefaster-cpython/ideas#436 for full discussion

• PR:GH-96421: Introduce cleanup contexts for inlined frames #98795

• PR:GH-96421: Insert shim frame on entry to interpreter #96319