[jdk11u-dev] RFR: 8254827: JVMCI: Enable it for Windows+AArch64 [v2]

[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.

Reka Kovacs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/307/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/307/files/fadd5b90..fadd5b90

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=307&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=307&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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