RFR: 8325910: Rename jnihelper.h

[Kim Barrett]

On Thu, 15 Feb 2024 02:32:02 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this trivial change that renames the file
>> test/hotspot/jtreg/vmTestbase/nsk/stress/jni/jnihelper.h to jnihelper.hpp, and
>> replaces uses of NULL in that file.
>> 
>> Testing: mach5 tier1
>
> Good + trivial.

Thanks for the review, @coleenp

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PR Comment: https://git.openjdk.org/jdk/pull/17861#issuecomment-1945322637