RFR: 8331921: Hotspot assembler files should use common logic to setup exported functions [v2]

[Magnus Ihse Bursie]

> As seen in [JDK-8331541](https://bugs.openjdk.org/browse/JDK-8331541), if we are not consistently setting all assembler directives correctly, we can get errors that are not detected by the linker.
> 
> We should stop duplicating this code and create a unified macro to properly setup functions, and use it everywhere.

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 five commits:

 - Merge branch 'master' into hotspot-assembler-functions
 - Fix copyright headers
 - Fix building on macos/aarch64
 - Use % instead of @ due to arm assembler
 - 8331921: Hotspot assembler files should use common logic to setup exported functions

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Changes: https://git.openjdk.org/jdk/pull/19138/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19138&range=01
  Stats: 604 lines in 22 files changed: 124 ins; 347 del; 133 mod
  Patch: https://git.openjdk.org/jdk/pull/19138.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19138/head:pull/19138

PR: https://git.openjdk.org/jdk/pull/19138