RFR: 8269130: Replace usages of Collection.toArray() with Collection.toArray(T[]) to avoid redundant array copying

[Brett Okken]

On Mon, 14 Jun 2021 17:00:29 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> I found few places, where code initially perform `Object[] Colleciton.toArray()` call and then manually copy array into another array with required type.
> This PR cleanups such places to more shorter call `T[] Collection.toArray(T[])`.

src/java.base/share/classes/java/security/Security.java line 656:

> 654:             return null;
> 655: 
> 656:         return candidates.toArray(new Provider[0]);

Is this called often enough to warrant creating a constant of `new Provider[0]` (benefits of this covered in the _Wisdom of the Ancients_ blog linked)?

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PR: https://git.openjdk.java.net/jdk/pull/4487