Auto merge of #135265 - pascaldekloe:fmt-int-speed, r=tgross35,ChrisDenton
Display of integers without raw pointers and without overflowing_literals The benchmarks as is measure formatting speed of literals. The first commit `black_box`-es input to simulate runtime speed instead. The second commit replaces `unsafe` pointer optimizations with plain array indices. The performance is equivalent on Apple M1. Needs peer review on Intel. Happy to do the 128-bit version too if such change is welcome.
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