Please review this small performance tweak `ArrayDeque`. `ArrayDeque` has an invariant in which any unused elements in the array must be null. In a couple of places, the code is setting contiguous ranges of elements to null using `for()` loops. This can be both simplified and sped up by using `Arrays.fill()` instead.
------------- Commit messages: - Use Arrays.fill() instead of for() loops to null out array elements. Changes: https://git.openjdk.org/jdk/pull/25237/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25237&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8356993 Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/25237.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25237/head:pull/25237 PR: https://git.openjdk.org/jdk/pull/25237
