[lworld] Integrated: 8252651: [lworld] Clear the instance klass mirror for inline type

[David Simms]

clear the mirror, don't set empty handle

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Commit messages:
 - 8252651: [lworld] Clear the instance klass mirror for inline type

Changes: https://git.openjdk.java.net/valhalla/pull/171/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=171&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252651
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/171.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/171/head:pull/171

PR: https://git.openjdk.java.net/valhalla/pull/171