RFR: 8310673: [JVMCI] batch compilation for libgraal should work the same way as for C2

[Tobias Hartmann]

On Mon, 16 Oct 2023 07:39:06 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> There's extra logic in the CompileBroker for waiting for blocking JVMCI compilations to try and prevent deadlock ([JDK-8148507](https://bugs.openjdk.org/browse/JDK-8148507)). However, this is not relevant for libgraal which does not run Java code that can be accessing locks used by other threads.
> 
> However, over time, this logic was extended to unblock a blocking compilation when a libgraal internal deadlock is detected. It turns out that this hides deadlocks or long compilations that should be solved in libgraal itself.
> 
> This PR makes blocking compilation with libgraal the same as blocking compilations for C1 and C2.
> 
> Testing: This has been tested for about 3 months against libgraal.

Looks reasonable to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16197#pullrequestreview-1679901562