RFR: 8325180: Rename jvmti_FollowRefObjects.h

[Julian Waters]

On Fri, 2 Feb 2024 16:34:19 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial change that renames the file
> test/hotspot/jtreg/vmTestbase/nsk/share/jvmti/jvmti_FollowRefObjects.h
> to jvmti_FollowRefObjects.hpp, and replaces uses of NULL in the file.
> 
> Testing: mach5 tier1

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/17689#pullrequestreview-1863209709