Integrated: 8309136: [JVMCI] add -XX:+UseGraalJIT flag

[Doug Simon]

On Tue, 30 May 2023 22:31:13 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> Use of the Graal-based JIT in OpenJDK currently requires the following flag: `-XX:+EnableJVMCIProduct`
> 
> This has no direct association with Graal. If the JDK image happens to include a non-Graal JVMCI implementation, it will be automatically selected. This would come as a surprise to users who equate JVMCI with Graal.
> 
> This PR introduces a new flag, `-XX:+UseGraalJIT` to address these shortcomings. It is an alias for `-XX:+EnableJVMCIProduct -Djvmci.Compiler=graal`. 
> 
> When `-XX:+UseGraalJIT` is specified, the VM fails fast at startup if there is a non-Graal JVMCI implementation or no JVMCI implementation in the JDK image.

This pull request has now been integrated.

Changeset: b3c9d678
Author:    Doug Simon <dnsimon at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b3c9d6785e061faf5ea9574bed2f9ab73cc11eaf
Stats:     66 lines in 5 files changed: 43 ins; 0 del; 23 mod

8309136: [JVMCI] add -XX:+UseGraalJIT flag

Reviewed-by: dholmes, kvn

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PR: https://git.openjdk.org/jdk/pull/14231