RFR: 8325347: Rename native_thread.h

[Leonid Mesnik]

On Tue, 6 Feb 2024 22:08:18 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

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

Marked as reviewed by lmesnik (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17737#pullrequestreview-1866483869