RFR: 8336663: [JVMCI] VM Crash on ZGC due to incompatible handle returned by HotSpotJVMCIRuntime#getConstantValue.

[Tomáš Zezula]

The `HotSpotJVMCIRuntime#getConstantValue` method returns a real JNI local handle instead of a JVMCI handle to prevent random crashes on ZGC.

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Commit messages:
 - JDK-8336663: [JVMCI] VM Crash on ZGC due to incompatible handle returned by HotSpotJVMCIRuntime#getConstantValue.

Changes: https://git.openjdk.org/jdk/pull/20219/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336663
  Stats: 32 lines in 3 files changed: 22 ins; 7 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/20219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20219/head:pull/20219

PR: https://git.openjdk.org/jdk/pull/20219