[jdk11u-dev] RFR: 8254827: JVMCI: Enable it for Windows+AArch64

[Reka Kovacs]

Changes are almost identical to the original commit, only that JVMCI and Graal are enabled in `hotspot.m4` instead of `jvm-features.m4`.

Depends on #301.

Part of the Windows/AArch64 port.

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/301

Commit messages:
 - Backport 88ee973334e6a155719bd2486da73567d59a7f1e

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/307/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=307&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254827
  Stats: 23 lines in 4 files changed: 16 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/307.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/307/head:pull/307

PR: https://git.openjdk.java.net/jdk11u-dev/pull/307