[ADT] Fix a bug in PackedVector::setValue for signed types (#159239) Without this patch, we forget to update the sign bit. When we assign: Vec[0] = -1; the sign bit is correctly set to 1. Overwriting the same element: Vec[0] = 1; does not update the sign bit, leaving the 4-bit as 0b1001, which reads -2 according to PackedVector's encoding. (It does not use two's complement.) This patch fixes the bug by clearing the sign bit when we are assigning a non-negative value.
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