Build macOS desktop gen_snapshot_arm64 and gen_snapshot_x64 as arm64 binary to run natively on Apple Silicon #101138
Description
On an arm64 Apple Silicon Mac, the published gen_snapshot_* binaries are x86_64 and therefore run with Rosetta translation.
./darwin-x64-profile/gen_snapshot_arm64: Mach-O 64-bit executable x86_64
./darwin-x64-profile/gen_snapshot_x64: Mach-O 64-bit executable x86_64
./darwin-x64-profile/gen_snapshot: Mach-O 64-bit executable x86_64
./darwin-x64/gen_snapshot_arm64: Mach-O 64-bit executable x86_64
./darwin-x64/gen_snapshot_x64: Mach-O 64-bit executable x86_64
./darwin-x64/gen_snapshot: Mach-O 64-bit executable x86_64
./darwin-x64-release/gen_snapshot_arm64: Mach-O 64-bit executable x86_64
./darwin-x64-release/gen_snapshot_x64: Mach-O 64-bit executable x86_64
./darwin-x64-release/gen_snapshot: Mach-O 64-bit executable x86_64
Dart does not currently support targeting x64 from a non-x64 host dart-lang/sdk#49768. However gen_snapshot_arm64 can be compiled as arm64 and therefore run natively on an arm64 Mac. gen_snapshot_x64 can also be compiled as a universal binary for AOT (but not JIT) builds, which is all we need for macOS targets.
Compile macOS gen_snapshot_arm64 as arm64, and publish in the arm64 Flutter install (flutter_macos_arm64_*.zip), as well as the macOS desktop artifacts that get curled when upgrading on an arm64 Mac.
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