RFR: 8360458: Rename Deferred<> to DeferredStatic<> and improve usage description

[Kim Barrett]

On Wed, 25 Jun 2025 07:24:53 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

>> Please review this change that renames Deferred<> to DeferredStatic<>, to
>> better reflect the intended usage. (This involves renaming the source file.)
>> This change also revises the documentation comment for the class to better
>> describe the intended usage.
>> 
>> In addition, there are a number of cleanups:
>> 
>> (1) The include guard didn't get updated when the name was previously changed
>> to Deferred. It's updated here to reflect the new name.
>> 
>> (2) There were problems with the include block that are fixed here.
>> 
>> (3) The changes from JDK-8359923 are backed out. They aren't useful with the
>> intended usage model.
>> 
>> (4) A gtest is added to test the class's functionality.
>> 
>> Testing: mach5 tier1, including new gtest
>
> test/hotspot/gtest/utilities/test_deferredStatic.cpp line 31:
> 
>> 29: #include <type_traits>
>> 30: 
>> 31: #include "unittest.hpp"
> 
> I see you've discussed the order of this include in https://github.com/openjdk/jdk/pull/25927#discussion_r2164307139 already. I agree with David that we should document an agreed upon style. I don't have anything against this style.

https://bugs.openjdk.org/browse/JDK-8360524

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PR Review Comment: https://git.openjdk.org/jdk/pull/25964#discussion_r2166648738