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

[fabioromano1]

On Thu, 15 May 2025 15:37:39 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:
> 
>   make magBitLength() an instance method

src/java.base/share/classes/java/math/BigInteger.java line 3619:

> 3617:             int nzInts = numberOfTrailingZeroInts();
> 3618:             if (nInts > nzInts || nInts == nzInts
> 3619:                     && nBits > Integer.numberOfTrailingZeros(magLen - 1 - nzInts)) {

@rgiulietti The bug was there.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25166#discussion_r2092889185