Use identity_hash for objects in the JVMTI TagMap table. If the object has no hashcode, it's not in the table. Tested with tier1-6.
------------- Commit messages: - 8256072: Eliminate JVMTI tagmap rehashing Changes: https://git.openjdk.org/jdk/pull/10938/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10938&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8256072 Stats: 108 lines in 12 files changed: 10 ins; 93 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/10938.diff Fetch: git fetch https://git.openjdk.org/jdk pull/10938/head:pull/10938 PR: https://git.openjdk.org/jdk/pull/10938
