Change JDK-8143925 implemented an x86-intrinsic for `CounterMode::implCrypt()`. In order to prevent regressions for customers who migrate from x86 to aarch64 (see for example https://github.com/aws/aws-graviton-getting-started/issues/110) we should intrinsify this method on aarch64 as well.

JDK-8143925 has an attached test (AES.java in https://bugs.openjdk.java.net/secure/attachment/55267/Tests.zip) which is based on the example vectors provided by "NIST Special Publication 800-38A" (https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf). This test (along with the JTreg tests under test/hotspot/jtreg/compiler/codegen/) should be used to verify the aarch64 implementation.