RFR: 8309665: Simplify Arrays.copyOf/-Range methods

[Alan Bateman]

On Thu, 8 Jun 2023 15:08:28 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> https://bugs.openjdk.org/browse/JDK-8301958 and later changes improved Arrays.copyOf/-Range methods to improve peak performance in microbenchmarks when copying the entire array, but it's resulted in a few lurking footprint benchmark issues that come down to incurring slightly more JIT activity. As a partial remedy I propose simplifying the implementation so that no new methods are added compared to the JDK 20 baseline. This patch maintains the microbenchmark speed-up from JDK-8301958 while reducing JIT compilations in startup/footprint benchmarks.

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14380#pullrequestreview-1471296218