RFR: 8309665: Simplify Arrays.copyOf/-Range methods [v2]

[Claes Redestad]

> 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.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Remove pointless comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14380/files
  - new: https://git.openjdk.org/jdk/pull/14380/files/09b06d77..ae809dfb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14380&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14380&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14380.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14380/head:pull/14380

PR: https://git.openjdk.org/jdk/pull/14380