RFR: 8268858: Determine register pressure automatically by the number of available registers for allocation [v2]

[Joshua Zhu]

On Mon, 21 Jun 2021 18:57:22 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Okay, I got it. So originally for 64-bit FLOATPRESSURE was 14 (16 -2) and that is where `-2` came from.
>
> But for avx512 it was 28 before and it is 30 now. I don't know which number is better for performance. But your change made difference.

Thanks. I update accordingly.

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PR: https://git.openjdk.java.net/jdk/pull/4505