RFR: 8372845: C2: Fold identity hash code if object is constant [v6]

[Chen Liang]

On Tue, 27 Jan 2026 06:51:54 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Use UpperCamelCase
>
> test/hotspot/jtreg/compiler/intrinsics/object/IdentityHashCodeFold.java line 37:
> 
>> 35:  * @summary Verify constant folding is possible for identity hash code
>> 36:  * @library /test/lib /
>> 37:  * @requires vm.compiler2.enabled
> 
> Drive-by comment:
> Do you really need this restriction? IR rules are only executed if C2 is available anyway.

Well, the plain test isn't that meaningful without C2. https://github.com/openjdk/jdk/pull/28589#discussion_r2615925589

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PR Review Comment: https://git.openjdk.org/jdk/pull/28589#discussion_r2730577795