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. ------------- Commit messages: - 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 Changes: https://git.openjdk.org/jdk/pull/19138/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19138&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8331921 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
