[jdk21u-dev] RFR: 8313878: Exclude two compiler/rtm/locking tests on ppc64le

[Goetz Lindenmaier]

"Backport" from 11 as we see these failing in 21, too.

I had to resolve, but probably clean.

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Commit messages:
 - Backport 6faea22b528a459294d2c2ae425275dfba824396

Changes: https://git.openjdk.org/jdk21u-dev/pull/1039/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1039&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313878
  Stats: 135 lines in 2 files changed: 6 ins; 70 del; 59 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1039.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1039/head:pull/1039

PR: https://git.openjdk.org/jdk21u-dev/pull/1039