[jdk17u] RFR: 8275809: crash in [CommonComponentAccessibility getCAccessible:withEnv:]

[Anton Tarasov]

A fix for a crash on accessing a weak JNI global ref.

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Commit messages:
 - Backport 7c88a59b7bca50061f120a1cf2c1d4457a1d741b

Changes: https://git.openjdk.java.net/jdk17u/pull/299/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=299&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275809
  Stats: 22 lines in 1 file changed: 7 ins; 5 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/299.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/299/head:pull/299

PR: https://git.openjdk.java.net/jdk17u/pull/299