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This PR allows building for ARM64 and ARM64EC.
ARM64 worked out of the box, but the
dispatch_selecttest failed, due to a use-after-free. For some reason this didn't affect other platforms/architectures, but writing to thebuffervariable caused a memory fault on native Windows ARM64.ARM64EC has a few define checks added, to ensure x64 ASM calls aren't run.
Tested using VS2022 and LLVM 21.1.2.