[jdk11u-dev] RFR: 8253015: Aarch64: Move linux code out from generic CPU feature detection [v2]

[Reka Kovacs]

> Not a clean backport. Differences to the original commit:
> 
> - Changes to files under `src/hotspot/cpu/aarch64/` and `src/hotspot/os_cpu/linux_aarch64/` are adjusted to cover hardware features supported in JDK 11.
> - As JDK 11 is built using an older C++ standard than tip, `static_assert`s need to be replaced with `STATIC_ASSERT` macros in `vm_version_linux_aarch64.cpp`.
> - The GraalVM related changes in `vmStructs_jvmci.cpp`, `AArch64HotSpotLIRGenerator.java` and `GraalHotSpotVMConfig.java` are skipped as they seem to be modifying code added in JDK 14 ([JDK-8226222](https://bugs.openjdk.java.net/browse/JDK-8226222) and [JDK-8231973](https://bugs.openjdk.java.net/browse/JDK-8229201)).
> 
> This is part of the Windows/AArch64 port.

Reka Kovacs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Backport ec9bee68660acd6abf0b4dd4023ae69514542256
 - Backport a4eaf9536c272862b5ec856bf263679be09bddc9

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Changes: https://git.openjdk.java.net/jdk11u-dev/pull/299/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=299&range=01
  Stats: 331 lines in 5 files changed: 105 ins; 157 del; 69 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/299.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/299/head:pull/299

PR: https://git.openjdk.java.net/jdk11u-dev/pull/299