RFR: 8281419: The source data for the color conversion can be discarded

[Phil Race]

On Tue, 8 Feb 2022 05:42:47 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> When we convert the image from one color profile to another one we copy data to the temp array, and after conversion, we commit both(src and dst). But the source array could be discarded since we do not(should not) change it. 
> 
> Tested on windows (fastest result after a few runs). ThreadsMAX is 32 threads. The test is just a "ColorConvertOp.filter()" for the opaque buffered image.
> 
> ![images](https://user-images.githubusercontent.com/14138494/152925400-cf248f88-e2ba-47ec-8d58-71784026ff8a.png)
> 
> https://jmh.morethan.io/?gists=541569ac2fe6173d471455d282680fa2,d3b91e1fba067c71fc73a6df8d47773f

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7375