[lworld] RFR: 82467538: [lworld] Merge of jdk-15+21 broke JVMCI testing

[David Simms]

_misc_flags is u4

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Commit messages:
 - 82467538: [lworld] Merge of jdk-15+21 broke JVMCI testing

Changes: https://git.openjdk.java.net/valhalla/pull/66/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/66/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-82467538
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/66.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/66/head:pull/66

PR: https://git.openjdk.java.net/valhalla/pull/66