RFR: 8361055: Serial: Inline SerialHeap::process_roots

[Thomas Schatzl]

On Mon, 30 Jun 2025 08:25:09 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Refactor roots processing in Serial (young-gc and full-gc) to clean up the control-flow and make is clearer what roots and closures are used in each context.
> 
> Test: tier1-8

Not really convinced about this change: if there is need to add a root now, you need to look at three places instead of one.
The parameter to select particular additional roots seems clear enough to me.

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PR Review: https://git.openjdk.org/jdk/pull/26038#pullrequestreview-2970434177