GH-122616: Simplify LOAD_ATTR_WITH_HINT and STORE_ATTR_WITH_HINT

[markshannon]

Removes branching code, using a DEOPT.

• Issue: LOAD_ATTR_WITH_HINT and STORE_ATTR_WITH_HINT have internal branching.  #122616

[markshannon]

The three failures are networking issues on the emulated platforms and a hypothesis issues

[scoder]

A somewhat mysterious bug report (a failure with a Python exception) that we received in Cython under Py3.14a1 bisects to this change:
cython/cython#6426 (comment)
Apparently, it introduced a behavioural change where some object attributes are set to (or read as) None (or possibly their super class default value, i.e. not set at all) instead of the expected value. Note that this is in plain Python code when running Cython to translate one of its modules, running python cython.py Cython/Compiler/Parsing.py from a source checkout.

[markshannon]

@scoder can you make a new CPython issue for the Cython problem?

I'd be very surprised if this PR was the root cause of the problem, but it clearly is a CPython issue not a Cython one.
Thanks.

[da-woods]

Hi both: I've created #125868 with a bit of extra debugging detail (I stopped trying to debug at the point that reality and pdb started contradicting each other)