[foreign-memaccess] [Rev 01] RFR: Add JMH test for loop over sliced segment

[Maurizio Cimadamore]

> This simple patch adds a simple benchmark that does a loop on a segment slice. I found this test useful when
> investigating escape analysis issues of derived segments, so I'm adding it here. With the current implementation
> (MemorySegmentImpl) the difference between the new `segment_loop` and `segment_loop_slice` are negligible, so this can
> be used to spot regressions in that logic.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Fix duplicate method and replace it with another benchmark to check performancs of view obtained after withAccessMode
  call.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/107/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/107/files/00d3ec18..2236bc13

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/107/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/107/webrev.00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/107.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/107/head:pull/107

PR: https://git.openjdk.java.net/panama-foreign/pull/107