Auto merge of #118490 - Nadrieril:arena-alloc-matrix, r=nnethercote

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Exhaustiveness: allocate memory better

Exhaustiveness is a recursive algorithm that allocates a bunch of slices at every step. Let's see if I can improve performance by improving allocations.

Already just using `Vec::with_capacity` is showing impressive improvements on my local measurements.

r? `@ghost`

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bors 2023-12-04 07:06:36 +00:00

parent 9999dfbc81 51460331ce

commit a7e7014123

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