RFR: 8341333: [JVMCI] Export JavaThread::_unlocked_inflated_monitor to JVMCI

[Yudi Zheng]

This is required for adapting https://github.com/openjdk/jdk/pull/19454 in JVMCI compiler

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Commit messages:
 - [JVMCI] Export JavaThread::_unlocked_inflated_monitor to JVMCI

Changes: https://git.openjdk.org/jdk/pull/21287/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21287&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341333
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21287.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21287/head:pull/21287

PR: https://git.openjdk.org/jdk/pull/21287