RFR: 8297142: jdk/jfr/event/runtime/TestShutdown.java fails on Linux ppc64le and Linux aarch64

[Ralf Schmelter]

This fails for the same reason as in https://bugs.openjdk.org/browse/JDK-8293166 while testing the dump on crash feature of JFR. Disabling tiered compilation avoids triggering this error.

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Commit messages:
 - Disable tiered compilation to reduce spurious test failures on Linux ppc64 and aarch64

Changes: https://git.openjdk.org/jdk/pull/11203/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11203&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297142
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11203.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11203/head:pull/11203

PR: https://git.openjdk.org/jdk/pull/11203