RFR: 8336663: [JVMCI] VM Crash on ZGC due to incompatible handle returned by HotSpotJVMCIRuntime#getJObjectValue [v2]

[Tomáš Zezula]

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

Tomáš Zezula has updated the pull request incrementally with one additional commit since the last revision:

  Improved getJObjectValue ducumentation.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20219/files
  - new: https://git.openjdk.org/jdk/pull/20219/files/0b1df2a6..d10f8184

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20219&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20219&range=00-01

  Stats: 13 lines in 2 files changed: 7 ins; 0 del; 6 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