RFR: 8319174: Enhance robustness of some j.m.BigInteger constructors [v5]

[Joe Darcy]

On Fri, 3 Nov 2023 19:14:18 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> Enhance `java.math.BigInteger` constructors taking a `byte[]` argument by improving guarantees of internal invariants.
>
> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Changed behavior on len == 0.

Looks fine.

May want to add some assert to verify the stated pre-conditions hold.

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Marked as reviewed by darcy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16449#pullrequestreview-1724068755