RFR: 8326716: JVMTI spec: clarify what nullptr means for C/C++ developers [v2]

[Serguei Spitsyn]

On Fri, 17 May 2024 04:34:22 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> So JDK-8324680 was somewhat mistaken about what needed to be done, and what
was done.

The `jvmti.xml` is used to generate several things with the XSL scripts:
 - JVMTI spec (`jvm.html`)
 - JVMTI api (`jvmti.h`)
 - `jvmtiEnter.cpp`, `jvmtiEnterTrace.cpp`
 
 In fact, it is pretty tricky to separate these usage aspects of `nullptr` or `NULL`.
 One of the approaches is to undo the [JDK-8324680](https://bugs.openjdk.org/browse/JDK-8324680).
 Please, let me know if you prefer this path.

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PR Comment: https://git.openjdk.org/jdk/pull/19257#issuecomment-2118354928