Integrated: 8303227: JniObjWithEnv should be NullablePointer compliant

[Julian Waters]

On Mon, 27 Feb 2023 08:19:53 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> JniObjWithEnv is a struct that is commonly managed by std::unique_ptr. Although it can support managing objects that are not raw pointers, any such objects have to be [NullablePointers](https://en.cppreference.com/w/cpp/named_req/NullablePointer). In the past this has [broken the build when compiler upgrades were carried out](https://bugs.openjdk.org/browse/JDK-8244220), so we should add in the final requirements to make the struct a true NullablePointer once and for all, to prevent similar issues from happening in the future

This pull request has now been integrated.

Changeset: 50dc041e
Author:    Julian Waters <jwaters at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/50dc041ee69eb62454bbf5c47a9545c6183d43d1
Stats:     12 lines in 1 file changed: 12 ins; 0 del; 0 mod

8303227: JniObjWithEnv should be NullablePointer compliant

Reviewed-by: asemenyuk

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PR: https://git.openjdk.org/jdk/pull/12758