RFR: 8300235: Use VarHandle access in Image(Input | Output)StreamImpl classes [v3]

[Roger Riggs]

On Thu, 2 Feb 2023 15:04:57 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR suggests improving performance by using the newly introduced class `jdk.internal.util.ByteArray` to improve packing/unpacking operations.
>> 
>> The PR also proposes adding a `ByteArrayLittleEndian` class for support for little endian packing/unpacking.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix problem in benchmark

Looks good. 
Thanks for the JMH benchmarks.

src/java.base/share/classes/jdk/internal/util/ByteArrayLittleEndian.java line 420:

> 418:     }
> 419: 
> 420:     private static VarHandle create(Class<?> viewArrayClass) {

Renaming the method to `createLittleEndian` would make the static assignments at the top unambiguous.

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Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12204