Simplify ArrayList calling addAll() Immediately

[CHANMYUNG]

I just simplified ArrayList construction.

	private static <E> Set<E> asUnmodifiableOrderedSet(Collection<E> elements) {
		List<E> list = new ArrayList<>();
		list.addAll(elements);
		list.sort(AnnotationAwareOrderComparator.INSTANCE);
		return new LinkedHashSet<>(list);
	}

it can be

	private static <E> Set<E> asUnmodifiableOrderedSet(Collection<E> elements) {
		List<E> list = new ArrayList<>(elements);
		list.sort(AnnotationAwareOrderComparator.INSTANCE);
		return new LinkedHashSet<>(list);
	}

And this change has a little profit to allocate memory

• See: https://stackoverflow.com/a/4238693

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[CHANMYUNG]

whut??? I'm sorry to make failure.. :(
I don't know what to do.

[snicoll]

@nooheat don’t you worry, this looks unrelated. Thanks for the PR!

[snicoll]

@nooheat thank you for making your first contribution to Spring Boot. This is now merged in 2.0.x and master.

[CHANMYUNG]

OMG❗️❗️
Thanks for merge.