RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v51]

[Roman Kennke]

On Thu, 24 Oct 2024 18:58:03 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Conditionalize platform specific parts of CompressedClassPointersEncodingScheme test
>
> test/hotspot/jtreg/runtime/CompressedOops/CompressedClassPointersEncodingScheme.java line 107:
> 
>> 105:         // the encoding range. We expect the encoding Base to start at the class space start - but to enforce that,
>> 106:         // we choose a high address.
>> 107:         if (Platform.isAArch64() || Platform.isX64()) {
> 
> @rkennke please also enable riscv for this test `CompressedClassPointersEncodingScheme.java`, it passed in my environment. Thanks!

Done.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1815690759