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Auto merge of #75936 - sdroege:chunks-exact-construction-bounds-check…
…, r=nagisa Get rid of bounds check in slice::chunks_exact() and related function… …s during construction LLVM can't figure out in let rem = self.len() % chunk_size; let len = self.len() - rem; let (fst, snd) = self.split_at(len); and let rem = self.len() % chunk_size; let (fst, snd) = self.split_at(rem); that the index passed to split_at() is smaller than the slice length and adds a bounds check plus panic for it. Apart from removing the overhead of the bounds check this also allows LLVM to optimize code around the ChunksExact iterator better.
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