[issue42141] Speedup various dict inits

[Marco Sulla]

Marco Sulla <launchpad.net at marco.sulla.e4ward.com> added the comment:

Note that this time I've no slowdown in the macro bench, since I used normal builds, not optimized ones. I suppose an optimized build will show slowdown because the new functions are not in the test battery.

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<https://bugs.python.org/issue42141>
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