RFR: 8323552: AbstractMemorySegmentImpl#mismatch returns -1 when comparing distinct areas of the same instance of MemorySegment [v2]

[Peter Levart]

> I belive there is a bug in `AbstractMemorySegmentImpl#mismatch` method. It returns `-1` (meaning that regions are equal) when passing the same instance of MemorySegment as both `srcSegment` and `dstSegment` parameters regardless of whether `srcFromOffset` and `dstFromOffset` as well as `srcToOffset` and `dstToOffset` are also equal.
> 
> Am I right?

Peter Levart has updated the pull request incrementally with one additional commit since the last revision:

  move special-case check for equal segments to the instance method (more probable)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17354/files
  - new: https://git.openjdk.org/jdk/pull/17354/files/7bcf0273..5112839b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17354&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17354&range=00-01

  Stats: 15 lines in 1 file changed: 11 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17354.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17354/head:pull/17354

PR: https://git.openjdk.org/jdk/pull/17354