RFR: 8332586: Avoid cloning empty arrays in java.lang.reflect.{Method,Constructor}

[jengebr]

On Wed, 22 May 2024 09:44:18 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Improve `java/lang/reflect/Method.java`  by eliminating needless cloning of Class[0] instances.  This cloning is intended to prevent callers from changing array contents, but smany Methods have zero exceptions or zero parameters, and returning the original `Class[0]` is sufficient.
>
> Please also enable GHA testing: https://github.com/jengebr/jdk/actions. You may need to trigger the test run manually after this, since the PR hook have already missed it. Go to "OpenJDK Sanity Checks" on the left on that page, then select your branch on in the drop-down on the right, and trigger the run.

@shipilev JMH benchmark is added.

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PR Comment: https://git.openjdk.org/jdk/pull/19327#issuecomment-2142587755