RFR: 8294359: Interpreter(AArch64) intrinsify Thread.currentThread()

[Hao Sun]

JDK-8278793 supported Thread.currentThread() intrinsification for interpreter(x64) part so as to get JVM startup benefit.

In this patch, we implement the AArch64 part.

Testings: tier1~3 and jdk_loom passed on Linux/AArch64.

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Commit messages:
 - 8294359: Interpreter(AArch64) intrinsify Thread.currentThread()

Changes: https://git.openjdk.org/jdk/pull/10441/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10441&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294359
  Stats: 15 lines in 4 files changed: 11 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/10441.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10441/head:pull/10441

PR: https://git.openjdk.org/jdk/pull/10441