[lworld] RFR: 8278350: [lworld] Compiler test failures after merge with mainline

[Tobias Hartmann]

Added two missing `@ForceInline` annotations and increased warmup iterations for a test now that [JDK-8276546](https://bugs.openjdk.java.net/browse/JDK-8276546) was merged in and IR verification is enabled with `-XX:CICompileThreshold=100`.

Thanks,
Tobias

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Commit messages:
- 8278350: [lworld] Compiler test failures after merge with mainline

Changes: https://git.openjdk.java.net/valhalla/pull/589/files
Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=589&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8278350
Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod
Patch: https://git.openjdk.java.net/valhalla/pull/589.diff
Fetch: git fetch https://git.openjdk.java.net/valhalla pull/589/head:pull/589

PR: https://git.openjdk.java.net/valhalla/pull/589