4173601071
This adds create_macos_gen_snapshot.py, which can be used to generate a multi-architecture (x86_64, i386) gen_snapshot fat binary. The resulting binary can then be run in the desired mode using: /usr/bin/arch -i386 path/to/gen_snapshot /usr/bin/arch -x86_64 path/to/gen_snapshot When creating AOT snapshots for iOS, running as an i386 binary will generate armv7 code, whereas running as an x86_64 binary will generate arm64 code. The primary user of this script is the build bot.
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