[foreign-memaccess+abi] RFR: 8295290: Add Windows ARM64 ABI support to the Foreign Function & Memory API

[Saint Wesonga]

There are 2 primary differences between the Windows ARM64 ABI and the macOS/Linux ARM64 ABI: variadic floating point arguments are passed in general purpose registers on Windows (instead of the vector registers). In addition to this, up to 64 bytes of a struct being passed to a variadic function can be placed in general purpose registers. This happens regardless of the type of struct (HFA or other generic struct). This means that a struct can be split across registers and the stack when invoking a variadic function.

This change introduces tests that compute the sum of the fields of structs containing 1-4 ints, floats, and doubles to verify that each field is correctly assigned a register or stack location when invoking a variadic function (both when the struct can be passed entirely in registers as well as when the struct spills onto the stack).

For details about the Foreign Function & Memory API, see JEP 434 defined at https://openjdk.org/jeps/434

The Windows ARM64 ABI conventions are documented at https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions

This work builds on @lewurm / Bernhard's branch at https://github.com/lewurm/openjdk/commits/foreign-windows-aarch64

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Commit messages:
 - Add Windows ARM64 ABI support to the Foreign Function & Memory API

Changes: https://git.openjdk.org/panama-foreign/pull/754/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=754&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295290
  Stats: 1210 lines in 18 files changed: 1187 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/754.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/754/head:pull/754

PR: https://git.openjdk.org/panama-foreign/pull/754