RFR: 8324799: Use correct extension for C++ test headers

[Leonid Mesnik]

On Wed, 28 Feb 2024 01:18:50 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change that renames some test .h files to .hpp.  These
> files contain C++ code and should be named accordingly.  Some of them contain
> uses of NULL, which we change to nullptr.
> 
> The renamed files are:
> 
> test/hotspot/jtreg/vmTestbase/nsk/share/aod/aod.h
> test/hotspot/jtreg/vmTestbase/nsk/share/jni/jni_tools.h  
> test/hotspot/jtreg/vmTestbase/nsk/share/jvmti/jvmti_tools.h
> test/hotspot/jtreg/vmTestbase/nsk/share/jvmti/JVMTITools.h
> test/hotspot/jtreg/vmTestbase/nsk/share/native/nsk_tools.h 
> 
> test/lib/jdk/test/lib/jvmti/jvmti_thread.h
> test/lib/jdk/test/lib/jvmti/jvmti_common.h
> test/lib/native/testlib_threads.h 
> 
> The #include updates were performed mostly mechanically, and builds would fail
> if there were mistakes.  The exception is test
> test/hotspot/jtreg/serviceability/jvmti/FollowReferences/FieldIndices/libFieldIndicesTest.cpp,
> which was added after I'd done the mechanical update, so was updated by hand.
> 
> The copyright updates were similarly performed mechanically. All but a handful
> of the including files have already had their copyrights updated recently,
> likely as part of JDK-8324681.
> 
> Thus, the only "interesting" changes are to the renamed files.
> 
> Testing: mach5 tier1

Marked as reviewed by lmesnik (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18035#pullrequestreview-1907166501