bpo-46409: Make generators in bytecode (GH-30633)

* Add RETURN_GENERATOR and JUMP_NO_INTERRUPT opcodes.

* Trim frame and generator by word each.

* Minor refactor of frame.c

* Update test.test_sys to account for smaller frames.

* Treat generator functions as normal functions when evaluating and specializing.

Include/cpython/genobject.h

@@ -13,7 +13,6 @@ extern "C" {
    and coroutine objects. */
 #define _PyGenObject_HEAD(prefix)                                           \
     PyObject_HEAD                                                           \
-    /* Note: gi_frame can be NULL if the generator is "finished" */         \
     /* The code object backing the generator */                             \
     PyCodeObject *prefix##_code;                                            \
     /* List of weak reference. */                                           \