I'm seeing errors when I run flutter run --local-engine host_profile --profile on a Mac x64 host using the current engine and flutter_tools.

flutter_tools reports that it can't find gen_snapshot_x64 or gen_snapshot_arm64 and that the FlutterMacOS.framework binaries are x64 only.

This is related to some of the recent flutter_tools changes for enabling ARM64 support (a618ca2, fd3c34c)

@jmagman @cbracken