RFR: 8275047: Optimize existing fill stubs for AVX-512 target [v4]

[Jatin Bhateja]

On Thu, 21 Oct 2021 20:23:56 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> This patch optimizes fill stub for AVX-512, to avoid call over head penalty we need to partially inline small fills which can fit in one full/partial vector. Will be sending a separate patch for it.
>
> @jatin-bhateja You need explicitly state in RFE and this PR that `Long` and `Double` are not covered to avoid confusion.

@vnkozlov , comments addressed.

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PR: https://git.openjdk.java.net/jdk/pull/5967