[lworld] RFR: 8375203: [lworld] compiler/valhalla/inlinetypes/TestOopsInReturnConvention.java is slow and intermittently times out

[Tobias Hartmann]

The test times out with `-XX:+VerifyOops`, often with AOT class loading. The problem is that it runs with a very large number of iterations and `-XX:+VerifyOops` is slow with C1 compiled code. I reduced the number of iterations and guarded the C1 runs by `@requires vm.flagless`.

Will run testing over the weekend to verify that this is sufficient. 

Thanks,
Tobias

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Commit messages:
 - 8375203: [lworld] compiler/valhalla/inlinetypes/TestOopsInReturnConvention.java is slow and intermittently times out

Changes: https://git.openjdk.org/valhalla/pull/2063/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2063&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375203
  Stats: 6 lines in 2 files changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/2063.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2063/head:pull/2063

PR: https://git.openjdk.org/valhalla/pull/2063