RFR: 8326975: Parallel: Remove redundant PSOldGen::is_allocated

[Thomas Schatzl]

On Wed, 28 Feb 2024 16:30:37 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple removing redundant code, since old-gen should have been allocated in the caller context.
> 
> Test: tier1-3

src/hotspot/share/gc/parallel/psParallelCompact.cpp line 873:

> 871:     return false;
> 872:   }
> 873: 

In principle this acts an assert, so maybe either adding one, or a comment like "// Memory reservation must have been successful if we reach here" would maybe be nice. Or renaming this method as `initialize_aux[iliary]_data` or something would already indicate that this code is not supposed to initialize everything.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18047#discussion_r1507169774