RFR: 8327964: Simplify BigInteger.implMultiplyToLen intrinsic [v6]

[Martin Doerr]

On Wed, 22 May 2024 14:47:43 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 incrementally with one additional commit since the last revision:
> 
>   address comments.

PPC64 part and shared code looks correct. "java/math/BigInteger" tests have passed on PPC64. I didn't review the other platforms.

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Marked as reviewed by mdoerr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18226#pullrequestreview-2072434441