RFR: 8268103: JNI functions incorrectly return a double after JDK-8265836

[Hao Tang]

On Wed, 2 Jun 2021 08:58:06 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Please review this trivial patch.  Stubs should return `-1` for `jlong` rather than `-1.0` (`double`) on aix/macosx.
> 
> Thoughts?

LGTM. Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/4300