RFR: 8311630: [s390] Implementation of Foreign Function & Memory API (Preview) [v4]

[sid8606]

> Implementation of "Foreign Function & Memory API" for s390x (Big Endian).

sid8606 has updated the pull request incrementally with one additional commit since the last revision:

  revert platform byte ordering changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14801/files
  - new: https://git.openjdk.org/jdk/pull/14801/files/f916864d..75229b4c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14801&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14801&range=02-03

  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14801.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14801/head:pull/14801

PR: https://git.openjdk.org/jdk/pull/14801