The method add_migrated_value_classes() is being called in non-preview mode leading to an assert due to the expected classes not being present in the AOT cache. The check for `EnableValhalla` is replaced with a check for preview mode. Verified with tier 1-5 tests.
------------- Commit messages: - 8370217: [lworld] Crash in add_migrated_value_classes after merging JDK-8350550 Changes: https://git.openjdk.org/valhalla/pull/1698/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1698&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370217 Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod Patch: https://git.openjdk.org/valhalla/pull/1698.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1698/head:pull/1698 PR: https://git.openjdk.org/valhalla/pull/1698
