RFR: 8256072: Eliminate JVMTI tagmap rehashing [v4]

[Coleen Phillimore]

On Thu, 3 Nov 2022 12:46:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> 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.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix has_no_hash into fast_no_hash_check().

Thanks Erik and Kim for reviewing!

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PR: https://git.openjdk.org/jdk/pull/10938