8357979: Compile jdk.internal.vm.ci targeting the Boot JDK version

[magicus]

From the bug description:

There are plans to build libgraal in JDK master using a version of Native Image running on a JDK one version behind JDK master. This Native Image execution needs to be able to load the JVMCI classes as they are built into the libgraal image. As such, the JVMCI classes must have a class file major version of N-1 where N is the major class file version of JDK master.

This PR is basically the same change as published by Doug in #25494, but it contains some cleanup and adds and uses the TARGET_RELEASE argument that Doug correctly realized was needed.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8357979: Compile jdk.internal.vm.ci targeting the Boot JDK version (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/26069/head:pull/26069
$ git checkout pull/26069

Update a local copy of the PR:
$ git checkout pull/26069
$ git pull https://git.openjdk.org/jdk.git pull/26069/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 26069

View PR using the GUI difftool:
$ git pr show -t 26069

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/26069.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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See the Progress checklist in the description for automated requirements.

[openjdk]

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[mlbridge]

Webrevs

• 00: Full (f02d2077)