8340398: [JVMCI] Unintuitive behavior of UseJVMCICompiler option

[toddjonker]

Clean backport of patch authored by @tzezula and approved by @dougxc

The patch default-enables useJVMCINativeLibrary when EnableJVMCI is on and libgraal present. While this is a behavior change, it seems unlikely that users would deploy libgraal and not want it used by JVMCI.

This streamlines configuration of our JDK+Graal distro, which in turn allows two failing tests to pass without modification.

Equivalent backport to 23: openjdk/jdk23u#136

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Issue

• JDK-8340398: [JVMCI] Unintuitive behavior of UseJVMCICompiler option (Bug - P4 - Requested)

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This backport pull request has now been updated with issue from the original commit.

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[toddjonker]

/approval request This streamlines configuration of our JDK+Graal distro, which in turn allows two failing tests to pass without modification. A corresponding backport PR for JDK23 is openjdk/jdk23u#136

[openjdk]

@toddjonker
8340398: The approval request has been created successfully.

[GoeLin]

Hi Todd,
I'm not sure this is a good candidate for backport.
As you say, it will change the way the compilers are loaded and operated.
This might be quite unexpected for graal/truffle users if they update from 21.0.5 to 21.0.6.

Also, how did you test this backport?