RFR: 8277: List ARM first

[Marcus Hirt]

...for Mac and listing architectures in the same way as for Linux (but being a bit more concrete for Mac).

Got annoyed when demoing.

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Commit messages:
 - 8277: Listing ARM first for Mac and listing archiectures in the same way as for Linux

Changes: https://git.openjdk.org/jmc/pull/595/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=595&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8277
  Stats: 6 lines in 1 file changed: 3 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jmc/pull/595.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/595/head:pull/595

PR: https://git.openjdk.org/jmc/pull/595