RFR: 8340974: Ambiguous name of jtreg property vm.libgraal.enabled [v2]

[Todd V. Jonker]

> This disambiguates the situation where libgraal is "enabled" for use by non-CompilerBroker compilations, without being used as the JIT compiler.
> 
> Per discussion at https://github.com/openjdk/jdk/pull/21120#issuecomment-2372462365 
> 
> Grep shows that the property and related method are not used in this codebase.  Tier1 tests on linux-x86_64-server-release pass cleanly.

Todd V. Jonker has updated the pull request incrementally with one additional commit since the last revision:

  Rename Compiler.isLibgraalEnabled to isLibgraalJIT

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21190/files
  - new: https://git.openjdk.org/jdk/pull/21190/files/386150d4..59a8ed3c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21190&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21190&range=00-01

  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/21190.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21190/head:pull/21190

PR: https://git.openjdk.org/jdk/pull/21190