Missed optimization: Array shadowed in same scope of declaration unnecessarily copied.

[PrototypeNM1]

Edit: initial attempt at reducing the scope led to an incorrect example, updating with the motivating example.

https://rust.godbolt.org/z/g4imX-

The above shadow on line 119 let position_deltas = position_deltas; results in a series of vmovups, but should be optimized to a noop.

[moxian]

Fixed by #72205.
Mildly ironic, since that PR was already in flight by the time this issue was submitted, but it took us 5 years to figure this out

[moxian]

I don't think i have the perms, but let me try...

@rustbot close

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