[jdk11u-dev] RFR: 8266170: -Wnonnull happens in classLoaderData.inline.hpp

[Paul Hohensee]

Part of GCC 11 compatibility. Did not apply cleanly due to presence of DumpSharedSpaces in the modified guarantee(). Backport is otherwise identical to original patch.

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Commit messages:
- Backport a1c942c02b65a7fc2a837d2bb43fa134dadcad11

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/702/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=702&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8266170
Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
Patch: https://git.openjdk.java.net/jdk11u-dev/pull/702.diff
Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/702/head:pull/702

PR: https://git.openjdk.java.net/jdk11u-dev/pull/702