RFR: 8318586: Explicitly handle upcall stub allocation failure [v2]

[Maurizio Cimadamore]

On Wed, 25 Oct 2023 10:10:57 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Explicitly handle UpcallStub allocation failures by terminating. We currently might try to use the returned `nullptr` which would fail sooner or later. This patch just makes the termination explicit.
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   call fatal without holding code cache lock

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16311#pullrequestreview-1698437302