GH-100762: Don't call gen.throw() in gen.close(), unless necessary. (GH-101013)

* Store exception stack depth in YIELD_VALUE's oparg and use it avoid expensive gen.throw() in gen.close() where possible.

Python/generated_cases.c.h

@@ -919,7 +919,6 @@
             // NOTE: It's important that YIELD_VALUE never raises an exception!
             // The compiler treats any exception raised here as a failed close()
             // or throw() call.
-            assert(oparg == STACK_LEVEL());
             assert(frame != &entry_frame);
             PyGenObject *gen = _PyFrame_GetGenerator(frame);
             gen->gi_frame_state = FRAME_SUSPENDED;