Chris Bracken 4576f56624
Run iOS gen_snapshot as x86_64 arch (#16323)
We are about to begin building gen_snapshot as a multi-arch binary,
which when run as x86_64 will generate arm64 AOT output, and when run as
i386 will generate armv7 AOT output.

Currently, gen_snapshot is an x86_64 binary, so this change is
effectively preventative in nature, and is a no-op with the current
snapshotter.
2018-04-09 19:12:05 -07:00
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