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

[Julian Waters]

On Thu, 14 Aug 2025 23:59:23 GMT, Saint Wesonga <duke at openjdk.org> wrote:

> [ml64](https://learn.microsoft.com/en-us/cpp/assembler/masm/ml-and-ml64-command-line-reference?view=msvc-170) is set as the assembler for the Windows platform but is specific to the x64 platform. The [armasm64](https://learn.microsoft.com/en-us/cpp/assembler/arm/arm-assembler-command-line-reference?view=msvc-170) assembler should be used for Windows AArch64.
> 
> The -c and -Ta options are only valid for ml64 and -Ta can be removed from CompileFile.gmk (assembling for x64 works without it).

I'd prefer if -Ta could be kept somehow but there doesn't seem to be a clean way to do that, so this gets a +1 from me anyway

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Marked as reviewed by jwaters (Committer).

PR Review: https://git.openjdk.org/jdk/pull/26791#pullrequestreview-3123104105