RFR: 8326509: Clean up JNIEXPORT in Hotspot after JDK-8017234 [v2]

[Julian Waters]

On Fri, 23 Feb 2024 11:06:04 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Once [JDK-8017234](https://bugs.openjdk.org/browse/JDK-8017234) has been integrated, it is possible to do some cleanup. The goal of [JDK-8017234](https://bugs.openjdk.org/browse/JDK-8017234) was to not change any behavior, even if that behavior seemed odd.
>> 
>> Now let's try to fix that. We can:
>> 
>> a) remove JNIEXPORT from c2v functions.
>> b) make debug.cpp functions exported similarly on all platforms.
>> c) remove JNIEXPORT from aarch64 asm debug function.
>> 
>> Note that this PR is [dependent on](https://mail.openjdk.org/pipermail/jdk-dev/2021-March/005232.html) https://github.com/openjdk/jdk/pull/17955.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove jvmci globals

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/17967#pullrequestreview-1897936208