RFR: 8302850: Implement C1 clone intrinsic that reuses arraycopy code for primitive arrays [v10]

[Galder Zamarreño]

On Tue, 23 Apr 2024 13:37:49 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:

>> Thank you!
>> 
>>> what sizes would you choose? For the types, I would limit it to primitive types
>> 
>> Yes, checking the primitive types is fine. Let it be int[], long[], and byte[]. For size I would pick an odd.
>> 
>> 
>> static final int ITER = 2000; // ~ Tier3CompileThreshold
>> static final int ARRAY_SIZE = 999;
>
> If you like, you can inspect the output of the -XX:+PrintLIR option to see if C1 applies arraycopy as expected.

Expanded the tests in this class. I verified with `PrintLIR` that the methods are being C1 compiled.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17667#discussion_r1577391774