[jdk25u] RFR: 8363910: Avoid tuning for Power10 CPUs on Linux ppc64le when gcc < 10 is used

[Matthias Baesken]

8363910: Avoid tuning for Power10 CPUs on Linux ppc64le when gcc < 10 is used

-------------

Commit messages:
 - Backport 41c94eed37aad570229ee2c5fb51d9e5d0378a40

Changes: https://git.openjdk.org/jdk25u/pull/45/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=45&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8363910
  Stats: 9 lines in 1 file changed: 7 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u/pull/45.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/45/head:pull/45

PR: https://git.openjdk.org/jdk25u/pull/45