When instrumenting regularfor loops, we instrument theFOR_ITER instruction as theLEFT branch and thePOP_ITER instruction as theRIGHT branch.

This doesn't work forasync for as it uses exceptions to exit the loop.
Raising an exception is the documented behavior for exiting a [async] generator, so we will still need to generate an event for the exception being raised, much as we do inINSTRUMENTED_END_FOR as well as theBRANCH events.

Linked PRs

• GH-128534: Instrument branches forasync for loops. #130569
• GH-128534: Fix behavior of branch monitoring forasync for #130847