[issue32949] Simplify "with"-related opcodes

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

We have two competing PRs for this issue. Again.

For comparison, using the same micro-benchmark, PR 5112 has these timings:
Master branch: Mean +- std dev: 252 ns +- 4 ns
PR 5112: Mean +- std dev: 216 ns +- 4 ns

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32949>
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