Stevie Hryciw e8fdb249b6 std.math.big.int: Initialize limbs in addWrap
When a big.Int.Mutable had more than two limbs, it was possible for
this function to change the `len` field without zeroing limbs in the
active range. These uninitialized limbs would then be used in
`truncate()` and could cause invalid results.

Closes #13571
2023-04-20 16:00:37 -07:00
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