[PATCH] D82428: [clang][driver] allow `-arch arm64` to be used to build for mac when on Apple Silicon Mac without explicit `-target`

[Steven Wu via Phabricator via cfe-commits]

steven_wu accepted this revision.
steven_wu added a comment.
This revision is now accepted and ready to land.

LGTM.

Not sure if it makes more sense to break the patch into two commits:

- config.guess change is for building the correct host triple on apple silicon machine without explicitly specify it.
- the driver change is for better default on Apple silicon Mac.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D82428/new/

https://reviews.llvm.org/D82428