RFR: 8327964: Simplify BigInteger.implMultiplyToLen intrinsic [v7]

[Yudi Zheng]

On Fri, 24 May 2024 15:12:28 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

>> Moving array construction within BigInteger.implMultiplyToLen intrinsic candidate to its caller simplifies the intrinsic implementation in JIT compiler.
>
> Yudi Zheng has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'upstream/master' into JDK-8327964
>  - address comments.
>  - address comments.
>  - address comment.
>  - address comment.
>  - address comment.
>  - address comment.
>  - Simplify BigInteger.implMultiplyToLen intrinsic

Thanks for the reviews! Mach5 testing looks good except for a couple known timeouts unrelated to this PR. GHA test failure is due to [JDK-8332923](https://bugs.openjdk.org/browse/JDK-8332923).

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PR Comment: https://git.openjdk.org/jdk/pull/18226#issuecomment-2133444527