[aarch64-port-dev ] RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port

[Vladimir Kempik]

Backport of JEP-391 to jdk11u-dev
The PR has two commits, one is simple copy of linux_aarch64 to bsd_aarch64. This will allow to see the difference applied to os_cpu against linux_aarch64 version.

Total issues:
JDK-8253795: Implementation of JEP 391: macOS/AArch64 Port
JDK-8253816: Support macOS W^X
JDK-8253817: Support macOS Aarch64 ABI in Interpreter
JDK-8253818: Support macOS Aarch64 ABI for compiled wrappers
JDK-8253819: Implement os/cpu for macOS/AArch64
JDK-8253839: Update tests and JDK code for macOS/Aarch64
JDK-8254941: Implement Serviceability Agent for macOS/AArch64
JDK-8255776: Change build system for macOS/AArch64
JDK-8262903: [macos_aarch64] Thread::current() called on detached thread
JDK-8262896: [macos_aarch64] Crash in jni_fast_GetLongField

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Commit messages:
 - JDK-8253795: Implementation of JEP 391: macOS/AArch64 Port
 - Simple copy of linux_aarch64 into bsd_aarch64

Changes: https://git.openjdk.java.net/aarch64-port/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=aarch64-port&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253795
  Stats: 3155 lines in 74 files changed: 3046 ins; 28 del; 81 mod
  Patch: https://git.openjdk.java.net/aarch64-port/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/aarch64-port pull/14/head:pull/14

PR: https://git.openjdk.java.net/aarch64-port/pull/14