[jdk11u-dev] RFR: 8236490: Compiler bug relating to @NonNull annotation

[Guoxiong Li]

Hi all,

This pull request contains a backport of commit [23edb6f6](https://github.com/openjdk/jdk/commit/23edb6f6b22e157e143e7449d6a4ad3f28cceb21) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The patch has run well for a long time so that I think it has low risk to backport now.

Best Regards,
-- Guoxiong

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Commit messages:
 - Backport 23edb6f6b22e157e143e7449d6a4ad3f28cceb21

Changes: https://git.openjdk.org/jdk11u-dev/pull/1209/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1209&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8236490
  Stats: 117 lines in 2 files changed: 111 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1209.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1209/head:pull/1209

PR: https://git.openjdk.org/jdk11u-dev/pull/1209