RFR: 8367339: Parallel: Remove PSScavenge::should_scavenge

[Albert Mingkun Yang]

On Wed, 10 Sep 2025 14:03:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Removing (inlining) a compound method that performs two independent things, loading the obj from a location and checking whether the object belongs to young-gen. Existing callers are changed to use more fine-grained methods, which are more transparent and readable in their context.
> 
> Test: tier1-3

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/27193#issuecomment-3280042024