RFR: 8264179: [TESTBUG] Some compiler tests fail when running without C2

[Christian Hagedorn]

This fixes some compiler tests that fail when run without C2 due to C2-specific VM options by either adding `-XX:+IgnoreUnrecognizedVMOptions` or `@requires vm.compiler2.enabled` to let them pass without C2.

Thanks,
Christian

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Commit messages:
 - 8264179: [TESTBUG] Some compiler tests fail when running without C2

Changes: https://git.openjdk.java.net/jdk/pull/3197/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3197&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264179
  Stats: 6 lines in 5 files changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3197/head:pull/3197

PR: https://git.openjdk.java.net/jdk/pull/3197