RFR: 8325910: Rename jnihelper.h

[Coleen Phillimore]

On Thu, 15 Feb 2024 02:24:39 GMT, Kim Barrett <kbarrett 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.

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17861#pullrequestreview-1881655795