RFR: 8356891: Some code simplifications for basic BigIntegers' bit operations [v6]

[fabioromano1]

On Mon, 19 May 2025 17:34:16 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> Yes, but perhaps in the current version it's more clear what is the returned value according to the condition.
>
> One could see the suggested variant as "return magBitLength(), except for a corrective term in case blah blah..."

Moreover, the current version avoids a subtraction in almost all cases, although probably it is negligible.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25166#discussion_r2096217698