RFR: 8367981: Refine CompactHashtable comments

[Francesco Andreuzzi]

On Thu, 18 Sep 2025 10:53:25 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this patch?
> 
> The comments of CompactHashtable and related classes are out of date, and some comments are unclear, wrong or misleading.
> As the related classes are used in more and more scenarios, it's helpful to update the comments.
> 
> Thanks

src/hotspot/share/classfile/compactHashtable.cpp line 195:

> 193: size_t SimpleCompactHashtable::calculate_header_size() {
> 194:   // We have 5 fields. Each takes up sizeof(intptr_t). See WriteClosure::do_u4
> 195:   constexpr size_t bytes = sizeof(intptr_t) * 5;

The whole method could perhaps become a `constexpr`

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PR Review Comment: https://git.openjdk.org/jdk/pull/27360#discussion_r2358666947