[jdk21] RFR: 8308103: Massive (up to ~30x) increase in C2 compilation time since JDK 17

[Christian Hagedorn]

On Thu, 20 Jul 2023 06:26:59 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Backport of [JDK-8308103](https://bugs.openjdk.java.net/browse/JDK-8308103). Applies cleanly.
> 
> Thanks,
> Tobias

Looks good.

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk21/pull/141#pullrequestreview-1538537011