RFR: 8371571: Consolidate and enhance bulk memory segment ops benchmarks [v4]

[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.

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Add loop variant for mismatch

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28260/files
  - new: https://git.openjdk.org/jdk/pull/28260/files/f0d633d1..7f40672e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28260&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28260&range=02-03

  Stats: 13 lines in 1 file changed: 13 ins; 0 del; 0 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