support MI_OPT_ARCH when targeting multiple CMAKE_OSX_ARCHITECTURES #999
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When using
-DCMAKE_OSX_ARCHITECTURES='x86_64;arm64'to build universal binaries, the existing-march=armv8.1-aends up applying to both targets but is obviously invalid for the x86_64 target. Prefix with-Xarch_arm64to ensure it only applies to the arm64 target.