RFR: 8357979: [JVMCI] jdk.internal.vm.ci should have earlier class file version [v2]

[Doug Simon]

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

Doug Simon has updated the pull request incrementally with one additional commit since the last revision:

  use BOOT_JDK_SOURCETARGET instead

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25494/files
  - new: https://git.openjdk.org/jdk/pull/25494/files/fb1adbe4..739c5fb5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25494&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25494&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25494.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25494/head:pull/25494

PR: https://git.openjdk.org/jdk/pull/25494