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b57d93d8b9
Bounds-check with PtrMetadata instead of Len in MIR Rather than emitting `Len(*_n)` in array index bounds checks, emit `PtrMetadata(copy _n)` instead -- with some asterisks for arrays and `&mut` that need it to be done slightly differently. We're getting pretty close to removing `Len` entirely, actually. I think just one more PR after this (for slice drop shims). r? mir
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