[issue44511] Improve the bytecode for mapping patterns

[Brandt Bucher]

Change by Brandt Bucher <brandtbucher at gmail.com>:


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pull_requests: +27617
pull_request: https://github.com/python/cpython/pull/29357

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44511>
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