RFR: 8335604: Serial: Inline Generation::contiguous_available

[Thomas Schatzl]

On Wed, 3 Jul 2024 08:54:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial inlining a method.

I would probably have left the `contiguous_available` method in `TenuredGeneration` as a helper method, given that it has a nice comment to it.
Then again, I'm not too hung up on that as it's not too complicated code.

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20000#pullrequestreview-2163134117