RFR: 8356891: Some code simplifications for basic BigIntegers' bit operations [v4]

[Raffaello Giulietti]

On Tue, 13 May 2025 21:24:08 GMT, fabioromano1 <duke at openjdk.org> wrote:

>> Some changes in `Biginteger`s' bit operations that increase the code readability and slightly optimize the execution time.
>
> fabioromano1 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update names

Right.
Let's go with an instance method.

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PR Comment: https://git.openjdk.org/jdk/pull/25166#issuecomment-2883943091