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Auto merge of #106989 - clubby789:is-zero-num, r=scottmcm
Implement `alloc::vec::IsZero` for `Option<$NUM>` types
Fixes #106911
Mirrors the `NonZero$NUM` implementations with an additional `assert_zero_valid`.
`None::<i32>` doesn't stricly satisfy `IsZero` but for the purpose of allocating we can produce more efficient codegen.
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