RFR: 8371571: Consolidate and enhance bulk memory segment ops benchmarks

[Per Minborg]

This PR proposes to consolidate and standardize the benchmarks related to the bulk operations for memory segments. 

All the benchmarks will now run with (heap|native)x(aligned|unaligned)x(intint|intlong|longlong) combinations.

It should be noted that with this change, the running time for the benchmarks would increase significantly.

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Commit messages:
 - Fix copyright years
 - Improve BulkOp benchmarks

Changes: https://git.openjdk.org/jdk/pull/28260/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28260&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371571
  Stats: 572 lines in 5 files changed: 355 ins; 107 del; 110 mod
  Patch: https://git.openjdk.org/jdk/pull/28260.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28260/head:pull/28260

PR: https://git.openjdk.org/jdk/pull/28260