RFR: 8255234: ZGC: Bulk allocate forwarding data structures

[Per Liden]

On Fri, 23 Oct 2020 07:51:03 GMT, Per Liden <pliden at openjdk.org> wrote:

>> src/hotspot/share/gc/z/zRelocationSet.cpp line 66:
>> 
>>> 64: 
>>> 65:   // Update statistics
>>> 66:   ZStatRelocation::set_at_populate_relocation_set(_allocator.size());
>> 
>> Instead of `_allocator.size()`, one could use the same arg of `_allocator.reset()`, which is already known in this scope.
>
> Sure, I can change that.

Actually, the `size()` function will still be needed in the follow up patch #805, where the size isn't calculated in the same score. So in the end I think it's easier to just keep it here too.

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PR: https://git.openjdk.java.net/jdk/pull/804