RFR: 8326509: Clean up JNIEXPORT in Hotspot after JDK-8017234 [v4]

[Magnus Ihse Bursie]

> 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 with a new target base due to a merge or a rebase. The pull request now contains 10 commits:

 - Merge branch 'master' into hotspot-symbols-followup
 - Remove jvmci globals
 - 8326509: Clean up JNIEXPORT in Hotspot after JDK-8017234
 - Revert "Use #pragma instead of HIDDEN define"
   
   This reverts commit 00e40a7f6e4cdef6592d72b3d08063cdcc41532a.
 - Use #pragma instead of HIDDEN define
 - Rename the version script to version-script.txt
 - Restore linker script to linux/gcc builds
 - Rename the Windows export file to .def
 - Remove unused symbol _Copy_conjoint_bytes on linux/arm32
 - 8017234: Hotspot should stop using mapfiles

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Changes: https://git.openjdk.org/jdk/pull/17967/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17967&range=03
  Stats: 12 lines in 3 files changed: 0 ins; 8 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17967.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17967/head:pull/17967

PR: https://git.openjdk.org/jdk/pull/17967