[jdk25u] RFR: 8365579: ml64.exe is not the right assembler for Windows aarch64

[Voznia Anton]

Hi,

It's a clean backport of 2 fixes:
* The original one JDK-8365579
* The second JDK-8366195 that improves the first one 
I decided to make a single commit instead of two separate backports, since it makes sense to have both changes together.

Thanks!

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Commit messages:
 - 8365579: ml64.exe is not the right assembler for Windows aarch64

Changes: https://git.openjdk.org/jdk25u/pull/349/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=349&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365579
  Stats: 17 lines in 5 files changed: 12 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk25u/pull/349.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/349/head:pull/349

PR: https://git.openjdk.org/jdk25u/pull/349