Integrated: 8299576: Reimplement java.io.Bits using VarHandle access

[Per Minborg]

On Wed, 4 Jan 2023 08:48:56 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Currently, `java.io.Bits` is using explicit logic to read/write various primitive types to/from byte arrays. Switching to the use of `VarHandle` access would provide better performance and less code. 
> 
> Also, using a standard API for these conversions means future `VarHandle` improvements will benefit `Bits` too. 
> 
> Improvements in `Bits` will propagate to `ObjectInputStream`, `ObjectOutputStream` and `RandomAccessFile`.
> 
> Initial benchmarks and performance discussions can be found here: https://github.com/openjdk/panama-foreign/pull/762

This pull request has now been integrated.

Changeset: 3462438a
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/3462438ae1bc469243096abeb5adbe007ef14fe5
Stats:     467 lines in 3 files changed: 428 ins; 24 del; 15 mod

8299576: Reimplement java.io.Bits using VarHandle access

Reviewed-by: uschindler, alanb

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PR: https://git.openjdk.org/jdk/pull/11840