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

[Aleksey Shipilev]

On Tue, 21 May 2024 13:49:18 GMT, jengebr <duke 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.

This looks fine to me. Since this is a first-time contribution, someone else needs to take a look as well. You may want to put a simple microbenchmark somewhere here: 
https://github.com/openjdk/jdk/tree/master/test/micro/org/openjdk/bench/java/lang/reflect

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19327#pullrequestreview-2089223720