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

[Andrey Turbanov]

On Mon, 26 Jul 2021 19:55:09 GMT, Brett Okken <github.com+2996845+bokken 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/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/SystemDictionaryHelper.java line 92:
> 
>> 90:       }
>> 91: 
>> 92:       InstanceKlass[] searchResult = tmp.toArray(new InstanceKlass[0]);
> 
> Is it too far outside the scope of these changes to make `tmp` an `ArrayList` rather than a `Vector`?

I'll create separate PRs to migrate Vector usages to ArrayList.

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