RFR: 8300657: Remove null filtering in CLD oop handle area

Mon Jan 23 16:43:43 UTC 2023

In the CLD oop handle area, there is a null check before calling do_oop. This is unnecessary, as the closures all perform the same null filtering. Since it's a raw access, it also causes trouble for generational ZGC.

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Commit messages:
 - 8300657: Remove null filtering in CLD oop handle area

Changes: https://git.openjdk.org/jdk/pull/12145/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12145&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300657
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12145.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12145/head:pull/12145

PR: https://git.openjdk.org/jdk/pull/12145