Description of the problem / feature request:

--ios_multi_cpus should default to sim_arm64 on M1 Macs, but still defaults to x86_64.

Feature requests: what underlying problem are you trying to solve with this feature?

M1 Mac users shouldn't have to override --ios_multi_cpus to get the proper default.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

Build an ios_application target on an M1 Mac, see that the architecture is for the x86_64 simulator.

I think that this might be the issue:

d7628e1 changed the default in one place already.

What operating system are you running Bazel on?

macOS 11.6.1 (arm64)

What's the output of bazel info release?

release 6.0.0-pre.20211101.2