RFR: 8236136: tests which use CompilationMode shouldn't be run w/ TieredStopAtLevel

[TheShermanTanker]

Prevents the tests from JDK-8236136 from running when the required `TieredStopAtLevel` is not met, with the exception `compiler/jvmci/events/JvmciNotifyBootstrapFinishedEventTest` as it seems to already have the requirement set, and I'm not sure what (or whether) to update it's required `TieredStopAtLevel` to should the existing one be outdated (Would appreciate any feedback on this part)

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Commit messages:
 - Fix TieredStopAtLevel requirements for certain tests

Changes: https://git.openjdk.java.net/jdk/pull/7451/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7451&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8236136
  Stats: 3 lines in 3 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7451.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7451/head:pull/7451

PR: https://git.openjdk.java.net/jdk/pull/7451