RFR: 8315855: G1: Revise signature of set_humongous_candidate

[Thomas Schatzl]

On Thu, 7 Sep 2023 11:57:58 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple removing redundant method arg around humongous candidates.

Maybe in `register_humongous_candidate_region_with_region_attr()`, although it's not the direct place...

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15617#pullrequestreview-1617318339